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• nxclient crashes when trying to open a terminal from a remote client through "ssh -Y"

  - by user167328

  I support around 150 linux machines. I have 2 virtual machines on an ESXi server which I access via nxmachine v3 from a windows 7 box. These machines run CentOS5 with KDE and Lubuntu12.04.1 and they are the admin GUIs from which I support the 150 machines. The linux machines which I manage are redhat4/5, CentOS5 and ubuntu 10 and 12. Normally I contact the machines via ssh -Y. Today I did an ssh -Y to a remote machine which is running Ubuntu 12.10 and ssh 6.0p1. Then I tried to open an lxterminal on the remote machine which should display on my KDE desktop. This immediately and reproducably crashed my nxclient session. I tried again from my lubuntu system with the same effect. I have not observed the phenomenon from other machines yet. The message log on my KDE host shows: Unexpected termination of nxagent because of signal: 11 Logger::log nxnode 3920 Googling for this revealed no usable answer. Does anybody have a clue what is going on here or can give a hint how to solve the issue? Add On: I asked the user at the remote machine to export his DISPLAY to my host and open an lxterminal. This worked without problems i. e. the nxclient did not crash. Then the user tried to send me xeyes and this also killed the nxclient with the same error message found in the message log as above. This makes me suspect that the problem is not solely connected to ssh but maybe to some library stuff.

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• ssh connection operation timed out using rsync

  - by Mark Molina

  I use rsync to backup my remote server on my local device but when I combine it with a cron job my ssh times out. Just to be clear, the data is stored on a remote server and I want it stored on my local server. The backup request must be sent from my local server to the remote server. The command for backup up the data is working when I just type it in terminal like this: rsync -chavzP --stats USERNAME@IPADDRES: PATH_TO_BACKUP LOCAL_PATH_TO_BACKUP but when I combine it with a cron job like this: 10 11 * * * rsync -chavzP --stats USERNAME@IP_ADDRESS: PATH_TO_BACKUP LOCAL_PATH_TO_BACKUP the ssh connection times out. When the cronjob executes it send a mail to the root user with the output like this: From local.xx.xx.xx Tue Jul 2 11:20:17 2013 X-Original-To: username Delivered-To: [email protected] From: [email protected] (Cron Daemon) To: [email protected] Subject: Cron <username@server> rsync -chavzP --stats USERNAME@IPADDRES: PATH_TO_BACKUP LOCAL_PATH_TO_BACKUP X-Cron-Env: <SHELL=/bin/sh> X-Cron-Env: <PATH=/usr/bin:/bin> X-Cron-Env: <LOGNAME=username> X-Cron-Env: <USER=username> X-Cron-Env: <HOME=/Users/username> Date: Tue, 2 Jul 2013 11:20:17 +0200 (CEST) ssh: connect to host IP_ADDRESS port XX: Operation timed out rsync: connection unexpectedly closed (0 bytes received so far) [receiver] rsync error: unexplained error (code 255) at /SourceCache/rsync/rsync-42/rsync/io.c(452) [receiver=2.6.9] So the rsync command is working when just typed in terminal but not when used by a cronjob. Can anybody explain this?

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• SQL Server Remote Connections

  - by Barry

  Hi, I am at my wits end with trying to access a remote SQL Server 2008 R2 Express instance. Here are the following that I have tried. 1) I enabled remote connections in the instance properties. 2) I enabled sql server and windows authentication mode and created an account to log in using sql server authentication. 3) I started the SQL Server Browser service 4) I forwarded ports 1433 and 1434 on the router to the IP address of the machine hosting SQL Server. 5) I turned off firewalls on both the Machine running the instance and the router. 6) http://www.yougetsignal.com/tools/open-ports/ I used this to check whether or not both ports were open and it says that they are closed. I have the SQL Server Express instance running and the browser running. I have configured it to allow remote connections yet, it tells me they are both closed. I'm pretty confused at this stage. On the client Machine I am trying to connect using the following format machineip\SQLEXPRESS with SQL Server Management Studio Express. Thanks in advance

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• SQL Server Remote Connections

  - by Barry

  Hi, I am at my wits end with trying to access a remote SQL Server 2008 R2 Express instance. Here are the following that I have tried. 1) I enabled remote connections in the instance properties. 2) I enabled sql server and windows authentication mode and created an account to log in using sql server authentication. 3) I started the SQL Server Browser service 4) I forwarded ports 1433 and 1434 on the router to the IP address of the machine hosting SQL Server. 5) I turned off firewalls on both the Machine running the instance and the router. 6) http://www.yougetsignal.com/tools/open-ports/ I used this to check whether or not both ports were open and it says that they are closed. I have the SQL Server Express instance running and the browser running. I have configured it to allow remote connections yet, it tells me they are both closed. I'm pretty confused at this stage. On the client Machine I am trying to connect using the following format machineip\SQLEXPRESS with SQL Server Management Studio Express. Thanks in advance

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• Apache multiple vhost logs, stored locally and sent to remote logstash

  - by benbradley

  I'm investigating centralised logging and it seems there's so many different ways this can be done. I don't want to run logstash as a log "sender", preferring to keep the web servers as lean and simple possible. So that means either using syslog, syslog-ng or the one I'm testing now, rsyslog. But I would like to have separate vhost log files on the web server, in addition to these logs being sent to a remote log collector. I've tested rsyslog using the imfile module to watch the Apache log files, but this means I have to hard-code each vhost log file into my rsyslog.conf. Not ideal as people will invariably forget when they add/remove sites on the server. The reason I'm using rsyslog's imfile is that Apache doesn't appear to let you log to file and syslog. And I want to keep vhost-specific log files on the web server. So how can I do this? Is there a way of having rsyslog produce local log files and forward the logs to a remote collector? I am prepared to change my Apache config to log to a single access/error log for all vhosts, so long as there are vhost-specific log files produced somewhere on the web server machine. I just don't want to lose any logging info if the remote log collector can't be contacted for any reason. Any comments/suggestions? Cheers, B

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• Remote paging with Nagios when network is down and email won't work -- cellular modems and alternatives

  - by Quinten

  What is the best option for remote paging when network services are down? I'm looking for a solution that can let me know when network services are down during off-hours only, and especially when email/smtp services are out. Therefore, it needs to be redundant to our network and power supply. I'm imagining a cellular modem is one option. What's the price range for these? Is anybody using them and feel that they are worth the cost? I'm imagining that it's something we would end up sending an emergency page ~ 1x/month at most, so I'd like the pricing to reflect that--I don't mind a high per-page cost as long as it has a low recurring cost. Another option would be to expose at least one server to remote ping, and run a check script on a remote server. Are there paid options for this? Currently, we run Nagios on a Linux VM on a Windows 2008 Hyper-V host. It would be great if the solution would work in that environment, but I know it's tricky with external devices, and we could move Nagios to a standalone workstation if needed.

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• ssh - "Connection closed by xxx.xxx.xxx.xxx" - using password

  - by Michael B

  I attempted to create an new user account that I wish to use to log in using ssh. I did this (in CentOs): /usr/sbin/adduser -d /home/testaccount -s /bin/bash user passwd testaccount This is the error I receive when trying to log in via ssh: ~/.ssh$ ssh -v [email protected] OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to xxx.xxx.xxx [xxx.xxx.xxx.xxx] port 22. debug1: Connection established. debug1: identity file /home/user/.ssh/identity type -1 debug1: identity file /home/user/.ssh/id_rsa type 1 debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: identity file /home/user/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3 debug1: match: OpenSSH_4.3 pat OpenSSH_4* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-cbc hmac-md5 none debug1: kex: client->server aes128-cbc hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'xxx.xxx.xxx.xxx' is known and matches the RSA host key. debug1: Found key in /home/user/.ssh/known_hosts:8 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: gssapi-with-mic debug1: Unspecified GSS failure. Minor code may provide more information No credentials cache found debug1: Unspecified GSS failure. Minor code may provide more information No credentials cache found debug1: Unspecified GSS failure. Minor code may provide more information debug1: Next authentication method: publickey debug1: Offering public key: /home/user/.ssh/id_rsa debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Trying private key: /home/user/.ssh/identity debug1: Trying private key: /home/user/.ssh/id_dsa debug1: Next authentication method: password testaccount@xxx's password: Connection closed by xxx.xxx.xxx.xxx The "connection closed" message appeared immediately after entering the password (if I enter the wrong password it waits and then prompts for another password) I am able to log in from the same computer using other accounts that had been setup previously. When logged into the remote machine I am able to do 'su testaccount' Thanks for your time.

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• SSH to remote host (edgemarc 4200 or 4500 series routers) and pull arp data

  - by MaQleod

  I've been trying to think of a method to do this for days, but have not come up with anything yet. Ideally, this is what I'm looking to do: From a windows XP machine, I need to open an SSH connection to a remote host, send the arp command, and pull the text results of the command back for use on the client. I will need to parse this data and preferably produce a 2D array of IPs and MAC addresses. There will be no shared keys, this is all done with a username and password that will always be different, they will need to be fed into the command via variables that will be pulled from a database using an autoit script based on the WAN ip of the remote host. Now the actual parsing of the data and creation of the array will be easy if I can just get the text of the arp table. Is there any way to ssh to a remote host, run a command and return the data from that command to the client in a batch script or perl script (it is ok if it writes the text to a file, I can read it out of the file later, I just need it to get to the client)?

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• Executing a git command using remote powershell results in a NativeCommmandError

  - by user204777

  I am getting an error while executing a remote PowerShell script. From my local machine I am running a PowerShell script that uses Invoke-Command to cd into a directory on a remote Amazon Windows Server instance, and a subsequent Invoke-Command to execute script that lives on that server instance. The script on the server is trying to git clone a repository from GitHub. I can successfully do things in the server script like "ls" or even "git --version". However git clone, git pull, etc. result in the following error: Cloning into 'MyRepo'... + CategoryInfo : NotSpecified: (Cloning into 'MyRepo'...:String) [], RemoteException + FullyQualifiedErrorId : NativeCommandError This is my first time using PowerShell or a Windows Server. Can anyone provide some direction on this problem. The client script: $s = new-pssession -computername $server -credential $user invoke-command -session $s -scriptblock { cd C:\Repos; ls } invoke-command -session $s -scriptblock { param ($repo, $branch) & '.\clone.ps1' -repository $repo -branch $branch} -ArgumentList $repository, $branch exit-pssession The server script: param([string]$repository = "repository", [string]$branch = "branch") git --version start-process -FilePath git -ArgumentList ("clone", "-b $branch https://github.com/MyGithub/$repository.git") -Wait I've changed the server script to use start process and it is no longer throwing the exception. It creates the new repository directory and the .git directory but doesn't write any of the files from the github repository. This smells like a permissions issue. Once again invoking the script manually (remote desktop into the amazon box and execute it from powershell) works like a charm.

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• Error 2013: Lost connection to MySQL server during query when executing CHECK TABLE FOR UPGRADE

  - by Dean Richardson

  I just upgraded Ubuntu from 11.10 to 12.04. My rails app now returns the (passenger) error "Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) (Mysql2::Error)". I get a similar error when I try to access mysql at the command line on my Ubuntu server using mysql -u root -p. I have mysql-server 5.5 installed. I've checked and mysql is not running. When I try to restart it, it fails. Here are some key lines from the tail of /var/log/syslog after an attempted restart: dean@dgwjasonfried:/etc/mysql$ tail -f /var/log/syslog Mar 7 08:55:27 dgwjasonfried /etc/mysql/debian-start[5107]: Looking for 'mysqlcheck' as: /usr/bin/mysqlcheck Mar 7 08:55:27 dgwjasonfried /etc/mysql/debian-start[5107]: Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/var/run/mysqld/mysqld.sock' '--host=localhost' '--socket=/var/run/mysqld/mysqld.sock' '--host=localhost' '--socket=/var/run/mysqld/mysqld.sock' Mar 7 08:55:27 dgwjasonfried /etc/mysql/debian-start[5107]: Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/var/run/mysqld/mysqld.sock' '--host=localhost' '--socket=/var/run/mysqld/mysqld.sock' '--host=localhost' '--socket=/var/run/mysqld/mysqld.sock' Mar 7 08:55:27 dgwjasonfried /etc/mysql/debian-start[5107]: /usr/bin/mysqlcheck: Got error: 2013: Lost connection to MySQL server during query when executing 'CHECK TABLE ... FOR UPGRADE' Mar 7 08:55:27 dgwjasonfried /etc/mysql/debian-start[5107]: FATAL ERROR: Upgrade failed Mar 7 08:55:27 dgwjasonfried /etc/mysql/debian-start[5107]: molex_app_development.assets OK Mar 7 08:55:27 dgwjasonfried /etc/mysql/debian-start[5107]: molex_app_development.ecd_types OK Mar 7 08:55:27 dgwjasonfried /etc/mysql/debian-start[5124]: Checking for insecure root accounts. Mar 7 08:55:27 dgwjasonfried kernel: [ 7551.769657] init: mysql main process (5064) terminated with status 1 Mar 7 08:55:27 dgwjasonfried kernel: [ 7551.769697] init: mysql respawning too fast, stopped Here is most of /etc/mysql/my.cnf: Remember to edit /etc/mysql/debian.cnf when changing the socket location. [client] port = 3306 socket = /var/run/mysqld/mysqld.sock Here is entries for some specific programs The following values assume you have at least 32M ram This was formally known as [safe_mysqld]. Both versions are currently parsed. [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] Basic Settings user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp lc-messages-dir = /usr/share/mysql skip-external-locking Instead of skip-networking the default is now to listen only on localhost which is more compatible and is not less secure. bind-address = 127.0.0.1 And here are permissions for var/run/mysqld/mysqld.sock: srwxrwxrwx 1 mysql mysql 0 Mar 7 09:18 mysqld.sock I'd be grateful for any suggestions the community might have. I reviewed the related questions here and attempted some of the fixes offered but to no avail. Thanks! Dean Richardson Update: Thanks to quanta's suggestion, I looked at the /var/log/mysql/error.log file. I found error messages relating to pointers, fatal signals, and more stuff that I really couldn't make much sense of. I also found mysql man page references, however. One suggested that I try starting mysqld with the --innodb_force_recovery=# option, then attempt to dump (or drop) the offending/corrupted database or table. I worked through the escalating option levels one-by-one (innodb_force_recovery=1, innodb_force_recovery=2, etc.) This allowed me to successfully run mysql -u root -p from the command line and execute several commands. I was able to run queries on my production database, but any attempt to query, dump, or even drop my development database raised an error and led to me losing the connection to mysql. So I've made progress, but until I'm somehow able to drop or repair my development db I'm still unable to get my app to load. Any further advice or suggestions? Thanks! Dean Update: Right after running sudo mysqld --innodb_force_recover=1 from the command line, the error.log contains this: Right after retrying sudo mysqld --innodb_force_recover=1, The error.log file shows this: 130308 4:55:39 [Note] Plugin 'FEDERATED' is disabled. 130308 4:55:39 InnoDB: The InnoDB memory heap is disabled 130308 4:55:39 InnoDB: Mutexes and rw_locks use GCC atomic builtins 130308 4:55:39 InnoDB: Compressed tables use zlib 1.2.3.4 130308 4:55:39 InnoDB: Initializing buffer pool, size = 128.0M 130308 4:55:39 InnoDB: Completed initialization of buffer pool 130308 4:55:39 InnoDB: highest supported file format is Barracuda. InnoDB: The log sequence number in ibdata files does not match InnoDB: the log sequence number in the ib_logfiles! 130308 4:55:39 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... 130308 4:55:40 InnoDB: Waiting for the background threads to start 130308 4:55:41 InnoDB: 1.1.8 started; log sequence number 10259220 130308 4:55:41 InnoDB: !!! innodb_force_recovery is set to 1 !!! 130308 4:55:41 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306 130308 4:55:41 [Note] - '127.0.0.1' resolves to '127.0.0.1'; 130308 4:55:41 [Note] Server socket created on IP: '127.0.0.1'. 130308 4:55:41 [Note] Event Scheduler: Loaded 0 events 130308 4:55:41 [Note] mysqld: ready for connections. Version: '5.5.29-0ubuntu0.12.04.2' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu) Then after mysql -u root -p and mysql> drop database molex_app_development; ERROR 2013 (HY000): Lost connection to MySQL server during query mysql> the error.log contains: dean@dgwjasonfried:/var/log/mysql$ tail -f error.log /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f6a3ff9ecbd] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (7f6a1c004bd8): is an invalid pointer Connection ID (thread ID): 1 Status: NOT_KILLED The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains information that should help you find out what is causing the crash. 130308 4:55:39 [Note] Plugin 'FEDERATED' is disabled. 130308 4:55:39 InnoDB: The InnoDB memory heap is disabled 130308 4:55:39 InnoDB: Mutexes and rw_locks use GCC atomic builtins 130308 4:55:39 InnoDB: Compressed tables use zlib 1.2.3.4 130308 4:55:39 InnoDB: Initializing buffer pool, size = 128.0M 130308 4:55:39 InnoDB: Completed initialization of buffer pool 130308 4:55:39 InnoDB: highest supported file format is Barracuda. InnoDB: The log sequence number in ibdata files does not match InnoDB: the log sequence number in the ib_logfiles! 130308 4:55:39 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... 130308 4:55:40 InnoDB: Waiting for the background threads to start 130308 4:55:41 InnoDB: 1.1.8 started; log sequence number 10259220 130308 4:55:41 InnoDB: !!! innodb_force_recovery is set to 1 !!! 130308 4:55:41 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306 130308 4:55:41 [Note] - '127.0.0.1' resolves to '127.0.0.1'; 130308 4:55:41 [Note] Server socket created on IP: '127.0.0.1'. 130308 4:55:41 [Note] Event Scheduler: Loaded 0 events 130308 4:55:41 [Note] mysqld: ready for connections. Version: '5.5.29-0ubuntu0.12.04.2' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu) 130308 4:58:23 [ERROR] Incorrect definition of table mysql.proc: expected column 'comment' at position 15 to have type text, found type char(64). 130308 4:58:23 InnoDB: Assertion failure in thread 140168992810752 in file fsp0fsp.c line 3639 InnoDB: We intentionally generate a memory trap. InnoDB: Submit a detailed bug report to http://bugs.mysql.com. InnoDB: If you get repeated assertion failures or crashes, even InnoDB: immediately after the mysqld startup, there may be InnoDB: corruption in the InnoDB tablespace. Please refer to InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html InnoDB: about forcing recovery. 10:58:23 UTC - mysqld got signal 6 ; This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail. key_buffer_size=16777216 read_buffer_size=131072 max_used_connections=1 max_threads=151 thread_count=1 connection_count=1 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 346681 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x7f7ba4f6c2f0 Attempting backtrace. You can use the following information to find out where mysqld died. If you see no messages after this, something went terribly wrong... stack_bottom = 7f7ba3065e60 thread_stack 0x30000 mysqld(my_print_stacktrace+0x29)[0x7f7ba3609039] mysqld(handle_fatal_signal+0x483)[0x7f7ba34cf9c3] /lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0)[0x7f7ba2220cb0] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35)[0x7f7ba188c425] /lib/x86_64-linux-gnu/libc.so.6(abort+0x17b)[0x7f7ba188fb8b] mysqld(+0x65e0fc)[0x7f7ba37160fc] mysqld(+0x602be6)[0x7f7ba36babe6] mysqld(+0x635006)[0x7f7ba36ed006] mysqld(+0x5d7072)[0x7f7ba368f072] mysqld(+0x5d7b9c)[0x7f7ba368fb9c] mysqld(+0x6a3348)[0x7f7ba375b348] mysqld(+0x6a3887)[0x7f7ba375b887] mysqld(+0x5c6a86)[0x7f7ba367ea86] mysqld(+0x5ae3a7)[0x7f7ba36663a7] mysqld(_Z15ha_delete_tableP3THDP10handlertonPKcS4_S4_b+0x16d)[0x7f7ba34d3ffd] mysqld(_Z23mysql_rm_table_no_locksP3THDP10TABLE_LISTbbbb+0x568)[0x7f7ba3417f78] mysqld(_Z11mysql_rm_dbP3THDPcbb+0x8aa)[0x7f7ba339780a] mysqld(_Z21mysql_execute_commandP3THD+0x394c)[0x7f7ba33b886c] mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x10f)[0x7f7ba33bb28f] mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1380)[0x7f7ba33bc6e0] mysqld(_Z24do_handle_one_connectionP3THD+0x1bd)[0x7f7ba346119d] mysqld(handle_one_connection+0x50)[0x7f7ba3461200] /lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a)[0x7f7ba2218e9a] /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f7ba1949cbd] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (7f7b7c004b60): is an invalid pointer Connection ID (thread ID): 1 Status: NOT_KILLED The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains information that should help you find out what is causing the crash. --Dean

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• FTP timing out after login

  - by Imran

  For some reasons I cant access any of my accounts on my dedicated server via FTP. It simply times out when it tried to display the directories. Heres a log from FileZila... Status: Resolving address of testdomain.com Status: Connecting to 64.237.58.43:21... Status: Connection established, waiting for welcome message... Response: 220---------- Welcome to Pure-FTPd [TLS] ---------- Response: 220-You are user number 3 of 50 allowed. Response: 220-Local time is now 19:39. Server port: 21. Response: 220-This is a private system - No anonymous login Response: 220-IPv6 connections are also welcome on this server. Response: 220 You will be disconnected after 15 minutes of inactivity. Command: USER testaccount Response: 331 User testaccount OK. Password required Command: PASS ******** Response: 230-User testaccount has group access to: testaccount Response: 230 OK. Current restricted directory is / Command: SYST Response: 215 UNIX Type: L8 Command: FEAT Response: 211-Extensions supported: Response: EPRT Response: IDLE Response: MDTM Response: SIZE Response: REST STREAM Response: MLST type*;size*;sizd*;modify*;UNIX.mode*;UNIX.uid*;UNIX.gid*;unique*; Response: MLSD Response: ESTP Response: PASV Response: EPSV Response: SPSV Response: ESTA Response: AUTH TLS Response: PBSZ Response: PROT Response: 211 End. Status: Connected Status: Retrieving directory listing... Command: PWD Response: 257 "/" is your current location Command: TYPE I Response: 200 TYPE is now 8-bit binary Command: PASV Response: 227 Entering Passive Mode (64,237,58,43,145,153) Command: MLSD Response: 150 Accepted data connection Response: 226-ASCII Response: 226-Options: -a -l Response: 226 18 matches total Error: Connection timed out Error: Failed to retrieve directory listing I have restarted the FTP service serveral times but still It doesnt loads. I only have this problem when my server is reaching it peak usage which is still only 1.0 (4 cores), 40% of 4GB ram. The ftp connections isnt maxed out because only me and my colleague have access to FTP on the server.

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• I can't download or stream for more then 3 sec, and then the conection activity just dies

  - by JMHein

  Just got a new internet connection installed at my sisters place, but it randomly just stops working. At first it was only affecting flash videos. they would randomly just stop buffering. I did a lot of research on this and found that there can be many things that cause this exact trouble. I then tried IE and some flash would stream fine, but still random deaths. So I told my brother in law to reset the router and modem and that fixed the problem for them but not my laptop. I then started trying to fix the flash problem only to fined that downloads of any kind were affected. Now it is so bad that 50% of page loads will never finish because the connection drops to 0% usage with in a split sec. I can't get flash reinstalled because the installer is trying to download but the download dies at 8% I tried up loading a large file by FTP to a web server with no troubles. Yet any activity on my end that takes longer then about 1 sec to finish, just never finishes I can watch the network log in the taskmanager and it spikes for ruffly one sec then drops back to zero and when I go back to the web page it says it is still loading and no matter how long I let it sit it never does any thing more till I reload then it will again create a very short spike of activity on the connection and then drop to zero. Also if I start a download and it does drop off I can restart the download where it left off and get up to 100Kb/s for around the same one sec then it drops to around 14Kb/s then zero a sec latter... I am running Win 7 home prem x64 with FF11 and IE8 I have simply tried every thing I can short of calling up the ISP which very likely will get me no where fast. any advice on what step to take to figure this out would be nice. I am not even sure it is not just an ISP problem. (at least I should be able to get flash reinstalled once I get back home)

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• Configuring WPA WiFi in Ubuntu 10.10

  - by sma

  I am trying to configure my wireless network on my laptop running Ubuntu 10.10 and am having a bit of difficulty. I am a complete Linux newb, but want to learn it, hence the reason I'm trying to set this up. Here's the vitals: It is a Gateway 600 YG2 laptop. It was previously running Windows XP, but I installed Ubuntu 10.10 in place of it (not a dual boot, I removed XP altogether). I have an old wireless card that I'm trying to resurrect. I haven't really used the card in a couple years, but it seems to still work, I just can't connect to my home's wireless network. The card is a Linksys WPC11 v2.5. When I plug it in, Ubuntu recognizes the network, but won't connect to it. My home network uses WPA encryption and the only connection type that Ubuntu's network manager is giving me is WEP and then it asks for a key -- I have no idea what that key should be. So, basically, I'm asking, is there a way I can instead connect through WPA? I've tried creating a new connection in network manager, but that won't work, it keeps falling back to the WEP connection and asking me for a key. I have tried to install the XP driver using ndiswrapper but I don't know if that's working or not. Is there a way to tell if: A) the card is working as it should B) the correct drivers are installed (again, I installed the XP one using ndiswrapper NET8180.INF, but I'm not sure what to do next) Any help would be appreciated. Thank you.

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• Suspected Router problems, [closed]

  - by jordon_user

  I am new to this forum. I appreciate any help you can offer. I have been troubleshooting an error with both my WIRED Internet Connection I have 3 desktops running through this working connection (Router) with no problems. Two computers, one laptop and desktop experience the issue. If I connect directly to the Modem, on either, no problem on the internet. Through the Router, my computer connects for a period of time but if ever awaking my comp, or restarting, the yellow explanation mark returns. The only way I can get the connection up = cmd. ipconfig /release, ipconfig /renew. This constant command is annoying and was hoping for a permanent fix. Audio is also not working. I know its likely a driver error, but its an old comp we put together and if there's an easy fix itd be great to hear from you! If you need any more info just let me know. Thanks! THanks guys!

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• Remotely managing Hyper-V VMs from Windows 8 Client

  - by Vazgen

  Currently, I have a core Hyper-V Server hosting VMs for a domain controller and several domain-joined VDI infrastructure servers. The VMs are connected in that domain environment, but the remote management of the physical Hyper-V Server is set up using the same WORKGROUP (as the Windows 8 client I'm managing from) This makes it cumbersome to manage the VMs hosted on the physical server from my remote management Windows 8 client because I can only connect to the physical Hyper-V server and not the individual VMs hosted inside. Can I make my set up more flexible by hosting a second domain controller in a VM hosted on my Windows 8 machine and switching my remote management set up to use the same domain through? Meaning ALL physical and virtual machines including the VDI infrastructure under the same domain? I'm new to this just looking for some suggestions.

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• tcp msl timeout

  - by iamrohitbanga

  The following is given in the book TCP IP Illustrated by Stevens Quiet Time Concept The 2MSL wait provides protection against delayed segments from an earlier incarnation of a connection from being interpreted as part of a new connection that uses the same local and foreign IP addresses and port numbers. But this works only if a host with connections in the 2MSL wait does not crash. What if a host with ports in the 2MSL wait crashes, reboots within MSL seconds, and immediately establishes new connections using the same local and foreign IP addresses and port numbers corresponding to the local ports that were in the 2MSL wait before the crash? In this scenario, delayed segments from the connections that existed before the crash can be misinterpreted as belonging to the new connections created after the reboot. This can happen regardless of how the initial sequence number is chosen after the reboot. To protect against this scenario, RFC 793 states that TCP should not create any connections for MSL seconds after rebooting. This is called the quiet time Few implementations abide by this since most hosts take longer than MSL seconds to reboot after a crash. Do operating systems wait for 2MSL seconds now after a reboot before initiating a TCP connection. The boot times are also less these days. Although the ports and sequence numbers are random but is this wait implemented in Linux?

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• Verizon 4G LTE vs. a LAN

  - by n8wrl

  I have been having quite a bit of trouble getting my new Verizon 4G-LTE service running on a Windows 7 desktop. My desktop is on a LAN here at home with two other PC's. We all share printers, files, media, etc. Until yesterday, we also shared a Verizon 3G modem via a NetGear 3G broadband WAP. That isn't compatible with the 4G so now I am just trying to get the 4G modem working directly connected to one of the desktops. After some USB wrangling, it seems to work. Except, every 7-10 minutes the connection would drop. After some time on the phone with a very nice Verizon technician, it seems to be staying up - it's been up for 20 minutes now. He told me that my LAN was causing the 4G to drop. That traffic on my LAN, even though it is not destined for the internet (ICS not working yet) was causing the cell tower to detect an 'IP change' and a 'security violation' in my modem and drop my connection. Is this Verizon's way of forbidding more than one computer to share a modem? I have my computer running now without a LAN connection and the 4G is still up. But this isn't practical. Has anyone heard of this?

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• Windows Server 2012 Essentials - Trying to setup "Anywhere Access" but the "Computer Access" list for users is blank

  - by tetranz

  I have a new installation of Windows Server 2012 Essentials and I'm trying to setup "Anywhere Access" for both VPN and remote desktop. The basic setup is all working. Shared folders is working but remote desktop has no computers available. On the server, if I edit a user with the Essentials Dashboard and go to "Computer access", the list is empty. The desktop computers have been joined to the domain. I can see them in AD under "Computers". I think our mistake was that we didn't use the connector tool to join the domain. We moved from a previous domain and went to Computer / Properties, changed the domain and started with a new profile. Is there something I can do now to make these desktops available for remote desktop? I can access a desktop directly no problem by going directly to it with the RDP client on port 3389. I do that from the outside world through an SSH tunnel.

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• Routing to a Terminal Services Cluster

  - by Dave

  I am trying to connect to a Load Balanced Windows 2008 R2 cluster using Remote Desktop Services. I have no trouble connecting to the the Servers' IP addresses (.253.16 and .253.17) or the Cluster address (.253.20) from inside the subnet (.253). The trouble is when I try to connect from the other subnet(.251). I can remote to the other non-clustered servers (.253.12 and .253.15) inside the .253 subnet from the .251 without an issue. I receive a ping reply from the cluster and other servers when I am on the .251 subnet. But when I try to connect via remote desktop it times out but only to any of the IPs on the cluster (.20,.17,.16). My ASA 5510 handling the routing reports message in the log: Deny TCP (no connection) from 192.168.251.2/4283 to 192.168.253.16/3389 flag FIN PSH ACK Here is a picture if it helps http://dl.dropbox.com/u/4217864/terminal%20server.jpg Thanks for any help

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• tcp msl timeout implementation in linux

  - by iamrohitbanga

  The following is given in the book TCP IP Illustrated by Stevens Quiet Time Concept The 2MSL wait provides protection against delayed segments from an earlier incarnation of a connection from being interpreted as part of a new connection that uses the same local and foreign IP addresses and port numbers. But this works only if a host with connections in the 2MSL wait does not crash. What if a host with ports in the 2MSL wait crashes, reboots within MSL seconds, and immediately establishes new connections using the same local and foreign IP addresses and port numbers corresponding to the local ports that were in the 2MSL wait before the crash? In this scenario, delayed segments from the connections that existed before the crash can be misinterpreted as belonging to the new connections created after the reboot. This can happen regardless of how the initial sequence number is chosen after the reboot. To protect against this scenario, RFC 793 states that TCP should not create any connections for MSL seconds after rebooting. This is called the quiet time Few implementations abide by this since most hosts take longer than MSL seconds to reboot after a crash. Do operating systems wait for 2MSL seconds now after a reboot before initiating a TCP connection. The boot times are also less these days. Although the ports and sequence numbers are random but is this wait implemented in Linux? Also RFC 793 says that this wait is not required if history is maintained. Does linux maintain any history of used sequence numbers for connections to handle this case?

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• How do I setup routing for 2 companies with different Internet connections on the same LAN?

  - by Clint Miller

  Here's the setup: 2 companies (A & B) share office space and a LAN. A 2nd ISP is brought in and company A wants it's own Internet connection (ISP A) and company B wants it's own Internet connection (ISP B). VLANs are deployed internally to separate the 2 company's networks (company A: VLAN 1, company B: VLAN 2, shared VOIP: VLAN 3). With separate VLANs it's simple enough to use separate DHCP servers (or separate scopes on the same server) to assign the default gateway to each company's gateway for their Internet connection. Static routes can be created on each gateway to point traffic destined for the other company's VLAN or the voice VLAN so that all nodes are reachable as expected. However, I think this is a form of asymmetrical routing, right? (The path from node A1 to node B1 is not the same as the path back from node B1 to node A1). Can I setup policy-based routing to correct this? In that case, can I assign the same default gateway to every device on all VLANs and create a routing policy on a L3 switch to look at the source address and forward traffic to the appropriate next hop? In that case, I want the routing logic to go like this: If the destination address is known, forward the traffic (traffic destined for a different VLAN). If the destination address is unknown, forward the traffic to ISP A's gateway if the source address is on VLAN A; or forward the traffic to ISP B's gateway if the source address is VLAN B. Am I thinking about this problem in the correct way? Is there another way to solve this problem that I am overlooking?

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• Running Mathimatica-5 remotely

  - by oxinabox.ucc.asn.au

  Ok, I have Mathmatica 5 - a powerful CAS. I have a cheap netbook, wich not olny is too slow to run mathmatica on, I doubt it has the harddrive space. I do however have remote access to a number of very powerful computers, (most of wich run variose linuxes, but one of which is windows server 2008) Mostly over SSH but other protocols can be arraged for some, i'm sure. (I might even be able to remote desktop the windows server 2008) So I'ld like to install Mathmatica onto one of these machine and then run it remotely. Either from the command line via putty or via some other method. I glanced through the mathmatical documentaion and read soemthing about using some MathLink program, wich linkes the front end istalled on my computer to a remote kernal. Anyone have any expirience with this? I'm not sure if this belongs here or in SuperUser.

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• EC2-like virtualisation platform with non-RDP access

  - by code'

  I'm looking into setting up a few small VMs. The trouble is the software I intend to install on them (Cisco VPN Client) blocks out networking (other than to the target VPN destination...) with no workaround. This means that Remote Desktop or other methods of connecting to VMs that go via the Internet (e.g. GoToMyPC, LogMeIn) are a non-starter. What I'm really looking for is an EC2-like platform but which gives direct access to the VM through (for example) Hyper-V Manager. Sadly the only way they all seem to offer to remote control the VMs is direct access via Remote Desktop, whereas I need to be one layer above that (if that makes sense). A viable alternative would be to run virtualisation software within a Windows EC2 instance; obviously hardware virtualisation is impossible but I wonder if there are any software virtualisation platforms that could be run and that would work. Does anyone know if something like this exists/is possible? Thanks! C

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• Internet Troubles - PPPoE vs PPPoA?

  - by AkkA

  I have been having some internet troubles at home (ADSL2+ connection in Australia). We get random drop-outs from the authentication connection. It will keep the connection to the DSL service, but we lose authentication and either have to restart the router/modem (its combined, a Belkin one, not sure on model number) or unplug the phone cable, wait about 30 seconds and plug it in again. I've called the ISP (Telstra) a few times, but they only offer limited support when we dont use their supported hardware. Apparently something had happened on their side, they checked the box again (at least it sounded that simple), and told me it would be fine. It wasnt. I've replaced all the filters around the house, but that didnt help either. We do live a little bit away from the exchange (get a sync speed of about 3000/900), so I thought it could be due to line noise but that hasnt helped. Telstra allow both PPPoE and PPPoA connections (which I'm configuring through my router, dont have software on the PC side). I've been running PPPoA the whole time, would it make any difference changing it to PPPoE? If not, are there any other theories as to why we would be experiencing these drop-outs? It has been fine for at least 12 months, then suddenly started about 2 months ago.

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• VPN sharing on Mac OS X 10.5 machine

  - by Jens

  I have a rather weird problem. I want to share a VPN connection that has been established by my Mac OS X 10.5 computer with another machine in my network. This is what I did: In the /etc/hostcongig file on the main computer I added the line: IPFORWARDING=-YES- I assigned a fixed IP address to my computer (192.168.178.30), a fixed one to the other machine (192.168.178.60) and my computer's IP address as gateway on the other machine. I connected to my VPN using the internal Mac OS X VPN client (PPTP connection) I run this script: #!/bin/sh natd -same_ports -use_sockets -unregistered_only -dynamic -interface ppp0 -clamp_mss ipfw -f flush ipfw add divert natd ip from any to any via ppp0 ipfw add pass all from any to any sysctl -w net.inet.ip.forwarding=1 Source: Using (and sharing) a VPN connection on your Mac Now everthing works smootly, however speed is an issue. I get 1,8 MBit/s on my main machine and only 0,3 - 0,6 MBit/s on the other one. My question: What could possibly be wrong? Do I have to tweak MTU settings, is there any packet inspection ongoing that needs time....? Any help appreciated!

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