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• MysqlTunner and query_cache_size dilemma

  - by wbad

  On a busy mysql server MySQLTuner 1.2.0 always recommends to add query_cache_size no matter how I increase the value (I tried up to 512MB). On the other hand it warns that : Increasing the query_cache size over 128M may reduce performance Here are the last results: >> MySQLTuner 1.2.0 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.5.25-1~dotdeb.0-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in InnoDB tables: 6G (Tables: 195) [--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17) [!!] Total fragmented tables: 51 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 1d 19h 17m 8s (254M q [1K qps], 5M conn, TX: 139B, RX: 32B) [--] Reads / Writes: 89% / 11% [--] Total buffers: 24.2G global + 92.2M per thread (1200 max threads) [!!] Maximum possible memory usage: 132.2G (139% of installed RAM) [OK] Slow queries: 0% (2K/254M) [OK] Highest usage of available connections: 32% (391/1200) [OK] Key buffer size / total MyISAM indexes: 128.0M/92.0K [OK] Key buffer hit rate: 100.0% (8B cached / 0 reads) [OK] Query cache efficiency: 79.9% (181M cached / 226M selects) [!!] Query cache prunes per day: 1033203 [OK] Sorts requiring temporary tables: 0% (341 temp sorts / 4M sorts) [OK] Temporary tables created on disk: 14% (760K on disk / 5M total) [OK] Thread cache hit rate: 99% (676 created / 5M connections) [OK] Table cache hit rate: 22% (1K open / 8K opened) [OK] Open file limit used: 0% (49/13K) [OK] Table locks acquired immediately: 99% (64M immediate / 64M locks) [OK] InnoDB data size / buffer pool: 6.1G/19.5G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance Reduce your overall MySQL memory footprint for system stability Increasing the query_cache size over 128M may reduce performance Variables to adjust: *** MySQL's maximum memory usage is dangerously high *** *** Add RAM before increasing MySQL buffer variables *** query_cache_size (> 192M) [see warning above] The server has 76GB ram and dual E5-2650. The load is usually below 2. I appreciate your hints to interpret the recommendation and optimize the database configs.

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• Windows 7 PC freezes frequently with hard disk light constantly on

  - by Senthil

  I recently replaced a defective hard disk with a new one - Windows 7 - "A disk read error occured. Press Ctrl + Alt + Del to restart" I have been using the new hard disk with a Windows 7 installation for about 4 days. Now it has started freezing frequently. Sometimes every 2 minutes and sometimes every 10 seconds. There is lots of software installed - I am a developer and my PC is full of IDEs, database servers, web servers, developer tools, testing tools, all browsers etc.. My windows is up to date as of now. I have installed ALL updates including optional drivers etc. All my installed software is up to date. I scanned my computer using Microsoft Security Essentials and found nothing malicious. I did a chkdsk /r and found no problems. I did a memory diagnostic and found no problems. When I go into safe mode, it doesn't freeze and I am able to use it normally for longer periods of time. What other steps can I take to locate the problem?

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• Easiest way to do host name resolution with IPA?

  - by Luke

  We are currently using static LAN IP addresses for our internal non-public facing servers. We don't have DHCP configured. We're using Vyatta for our router and firewall. The firewall is configured to be zone based. We want to setup IPA for centralized authentication (LDAP+Kerberos). IPA is requiring resolvable host names. I want to avoid having to enter DNS records by hand. What is the most painless way to make host names resolvable that works with IPA in a Linux only environment? We arn't using anything to resolve host names now. Up until now we've been using static ip addresses and local users on each server. We've looked at BIND, DHCP (does that even solve the problem?), and multicast DNS. At this point we're not sure which solution would work best. Is there another option we haven't considered? Security is very important. We have multiple zones where each zone has very specific or no access to another zone. DNS for public domains is forwarded from Vyatta to our ISP's DNS server.

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• DFS Root namespace is RDWR for all users

  - by Patrick

  We have an existing DFS Replication and Namespace group that we use to serve the company's files. This has been operating fine for us for some time now, and continues to do so. however a situation arose yesterday afternoon that has led us to be stumped. The problem is that we have our name space presented as : \\domain.co.uk\public\[8 or 9 folders that are mapped to the users in the business] We had a problem this morning that meant that a number of users started mapping their AD Home Drive directly to the \\domain.co.uk\public directory and we found that they had read/write. This rapidly became a problem as a at least one director saved some moderately sensitive documents in there and basically anyone could read them. I've tidied up that specific problem with some deft scripting and a slight modification of group policy. However I would like to make \public read only, the trouble is I can't work out where the ACLs for that folder would be held. All the folders that are presented as \\domain.co.uk\public\[folder] are 'real' folders on logical volumes on our DFS servers so are secured with groups that are applied via the 'security' tab. I'd like to do the same on \public but I can't find it. I have looked through amongst other things \Sysvol\domain.co.uk but can't find it and after a lot of clicking and a bit of reading I can't see how to lock it down. Any thoughts?

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• Server 2008 email on Event variables

  - by Jeff Miles

  One of the new features of Server 2008 is the ability to attach a task to a specific event in the event logs. One of the actions available is to send an email through a SMTP server. This is working great, however it would be ideal if in the message body, the Event contents could be placed. I have tried using $eventdescription and %eventdescription%, but those are just shots in the dark. Any amount of googling produces no results. Does anyone know if this is possible? Update: Sparks' suggestion below is a step in the right direction I believe, however that method doesn't seem to work for all values. For example, I can pull the RecordID, Severity and Channel as shown, but I can't use the same method to retreive the EventID, or most importantly the description. Here's the raw XML from one event: [Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"] [System] [Provider Name="DFSR" /] [EventID Qualifiers="16384"]4412[/EventID] [Level]4[/Level] [Task]0[/Task] [Keywords]0x80000000000000[/Keywords] [TimeCreated SystemTime="2009-05-14T18:18:09.000Z" /] [EventRecordID]45692[/EventRecordID] [Channel]DFS Replication[/Channel] [Computer]servername.domain.com[/Computer] [Security /] [/System] [EventData] [Data]9046C3F4-843E-4A53-B941-4B20764072E5[/Data] [Data]D:\departments\Geomatics\Plan Quality\Data Processing\CG3533017 2009-05-13 KT FIXED[/Data] [Data]D:\departments[/Data] [Data]{26D5F604-E603-4F87-8EC3-DE9A945DA8FD}-v927199[/Data] [Data]Departments[/Data] [Data]swg.ca\files\departments[/Data] [Data]B8242CE2-F5EB-47DA-BA5B-1DD2F7EE3AB9[/Data] [Data]DFAA7A54-66CB-4C31-81A0-0F861382C32C[/Data] [Data]CG3533017 2009-05-13-{26D5F604-E603-4F87-8EC3-DE9A945DA8FD}-v927199[/Data] [/EventData] [/Event] I have tried using a ValueQuery for EventData, but it returns no data.

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• Must have local user to authenticate Samba to AD?

  - by Phil

  I've got a CentOS 5.3 server with Samba running. I've joined this server to my domain in the hopes of allowing AD users some access to my Samba shares. I've found that this works, but only as long as the AD username that I'm trying to authenticate with is also a local user on the server. In other words, if I'm trying to access a share, and try to authenticate with the AD username "joe", I get errors unless I create a user named 'joe' on the server. I don't have to create a matching password or anything....the local user's password is always blank, so I do know that the authentication is actually happening against the AD. Here's my smb.conf file: [global] workgroup = <mydomain> server string = <snip> netbios name = HOME security = ADS realm = <mydomain.com> password server = <snip> auth methods = winbind log level = 1 log file = /var/log/samba/%m.log [amore] path = /var/www/amore browseable = yes writable = yes valid users = DOMAIN\user1 DOMAIN\user2 DOMAIN\user3 DOMAIN\user4 I would assume that my kerberos settings are fine, as I've joined the domain and can use wbinfo to see users and groups. However, I can provide that info if necessary. Anyone have any ideas?

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• Copying files to my laptop makes them locked

  - by John

  When I save files from e.g. remote desktop or from an email (outlook) attachments, or from skype even to my local machine they show a locked Icon on the file. Then e.g. SQL Server doesn't let me restore backups as it says the operating system doesn't have access to the file. I've had success fixing this by setting the ownership of the parent folder to my user and then let it apply to sub folders. Also sometimes I need to click - Proerties - Security - Advanced - Change Permmissions, then check "change child permissions..." and apply on the parent dir. I'm using Windows 7 64 bit Proffessional, on HP Probook 4530, and I have a administrator user. This is a real pain to do everytime. I suspect it might be because of HP software that came with the laptop, I think there is drive encryption as part of the protect tools. Although I'm hoping there's something in windows i can set to change the behaviour to not lock these files.

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• Determine from where is "sh" being run under apache www-data user using using PF or NETSTAT

  - by Eugene van der Merwe

  I am working with a compromised Ubuntu 8.04 Plesk 9.5.4 server. It seems that a script on the server is continuously doing reverse lookups to random IPs on the Internet. I first spotted it during by using top and then noticed flashes of this coming up continuously: sh -c host -W 1 '198.204.241.10' I wrote a this script to interrogate ps every 1 second to see how frequently this script happens: #!/bin/bash while : do ps -ef | egrep -i "sh -c host" sleep 1 done The results are that this script runs often, every few seconds: www-data 17762 8332 1 10:07 ? 00:00:00 sh -c host -W 1 '59.58.139.134' www-data 17772 8332 1 10:07 ? 00:00:00 sh -c host -W 1 '59.58.139.134' www-data 17879 17869 0 10:07 ? 00:00:00 sh -c host -W 1 '198.204.241.10' www-data 17879 17869 1 10:07 ? 00:00:00 sh -c host -W 1 '198.204.241.10' www-data 17879 17869 0 10:07 ? 00:00:00 sh -c host -W 1 '198.204.241.10' root 18031 17756 0 10:07 pts/2 00:00:00 egrep -i sh -c host www-data 18078 16704 0 10:07 ? 00:00:00 sh -c host -W 1 '59.58.139.134' www-data 18125 17996 0 10:07 ? 00:00:00 sh -c host -W 1 '91.124.51.65' root 18131 17756 0 10:07 pts/2 00:00:00 egrep -i sh -c host www-data 18137 17869 0 10:07 ? 00:00:00 sh -c host -W 1 '198.204.241.10' www-data 18137 17869 1 10:07 ? 00:00:00 sh -c host -W 1 '198.204.241.10' My theory is if I can see who is launching the sh process or form where it's launched I can isolate the problem further. Can somebody please guide me using netstat or ps to identify from where sh is being run? I might get many suggestions that the OS is out of date and so the Plesk, but please bear in mind there are some very concrete reasons why this server is running legacy software. My question is aimed at a advanced Linux systems administrators who have in depth experience with security compromises and using netstat and ps to get to the bottom of it.

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• Server 2008 R2 boot is at 2 hours and counting. What now?

  - by Jesse

  This morning, we rebooted our Server 2008 R2 box. No problem, came right back up. Then we shut it down and let it install windows updates. While it was off, we added some RAM. Then we turned it back on. The system came right back up to the "press ctrl-alt-delete" screen, so far, so good. I logged in. The system got as far as "Applying Group Policy" -- then spent almost an hour applying drive mappings. Finally finished that, and has now spent 30 minutes on waiting for the Event Notification Service. I still haven't been able to log in. Remote desktop service doesn't appear to be running yet. I tried viewing the event log from another machine. I see that the box is writing to the Security log, but there are no events in System or Application in the last 45 minutes. Digging through the System log of events from 45 minutes ago, I see a bunch of timeouts: A timeout (30000 milliseconds) was reached while waiting for a transaction response from the ShellHWDetection service. [lots of these] A timeout (30000 milliseconds) was reached while waiting for a transaction response from the wuauserv service. A timeout (30000 milliseconds) was reached while waiting for a transaction response from the SessionEnv service. A timeout (30000 milliseconds) was reached while waiting for a transaction response from the Schedule service. A timeout (30000 milliseconds) was reached while waiting for a transaction response from the CertPropSvc service. What can I do? Should I try shutting it down remotely, or will that do more damage?

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• suPHP not working

  - by amarc

  OS: Ubuntu 10.04 etc/suphp/suphp.conf: [global] ;Path to logfile logfile=/var/log/suphp/suphp.log ;Loglevel loglevel=info ;User Apache is running as webserver_user=www-data ;Path all scripts have to be in docroot=/home ;Path to chroot() to before executing script ;chroot=/mychroot ; Security options allow_file_group_writeable=false allow_file_others_writeable=false allow_directory_group_writeable=false allow_directory_others_writeable=false ;Check wheter script is within DOCUMENT_ROOT check_vhost_docroot=true ;Send minor error messages to browser errors_to_browser=false ;PATH environment variable env_path=/bin:/usr/bin ;Umask to set, specify in octal notation umask=0077 ; Minimum UID min_uid=100 ; Minimum GID min_gid=100 [handlers] ;Handler for php-scripts application/x-httpd-suphp="php:/usr/bin/php-cgi" ;Handler for CGI-scripts x-suphp-cgi="execute:!self" some vhost in sites-enabled: NameVirtualHost *:8080 <VirtualHost *:8080> ServerAdmin ... ServerName ... ServerAlias ... AddType application/x-httpd-php .php AddHandler application/x-httpd-php .php suPHP_Engine on suPHP_UserGroup user user suPHP_ConfigPath "/home/user/etc" suPHP_PHPPath /usr/bin DocumentRoot /home/user/web/site.com/ ErrorLog /var/log/apache2/site.com-error_log CustomLog /var/log/apache2/site.com-access_log common <Directory /home/user/web/site.com/> Order Deny,Allow Allow from all Options +Indexes </Directory> </VirtualHost> But when I did nano /home/user/web/id.php and paste <?php system('id'); ?> in it, result I get is: uid=33(www-data) gid=33(www-data) groups=33(www-data) Have no idea what to do so I was hoping comunity could help ty.

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• 403 Forbiden on Apache (CentOS) Server

  - by pouya

  These are my VM setup: HOST: windows 7 ultimate 32bit GUEST: CentOs 6.3 i386 Virtualization soft: Oracle virtualBox 4.1.22 Networking: NAT -> (PORT FORWARD: HOST:8080 => GUEST:80) Shared Folder: centos all the project files goes into shared folder and for each project file a virtualhost conf file is created in /etc/httpd/conf.d/ like /etc/httpd/conf.d/$domain I wasn't able to see anything in my browser before disabling both windows firewall and iptables in centos after that if i type for example: http://www.$domain:8080/ all i see is: Forbidden You don't have permission to access / on this server. Apache/2.2.15 (CentOS) Server at www.$domain.com Port 8080 A sample Virtual Host conf file: <VirtualHost *:80> #General DocumentRoot /media/sf_centos/path/to/public_html ServerAdmin webmaster@$domain ServerName www.$domain ServerAlias $domain *.$domain #Logging ErrorLog /var/log/httpd/$domain-error.log CustomLog /var/log/httpd/$domain-access.log combined #mod rewrite RewriteEngine On RewriteLog /var/log/httpd/$domain-rewrite.log RewriteLogLevel 0 </VirtualHost> centos shared folder is availabe to guest at /media/sf_centos These are file permissons for sf_centos: drwxrwx--- root vboxsf vboxsf group includes: apache and root So these are my questions: 1- How to solve Forbidden Problem? 2- How to setup both host and guest firewalls? 3- How can i improve this developement environment to simulate production environment as much as possible specially security improvements?

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• How can I prevent a DDOS attack on Amazon EC2?

  - by cwd

  One of the servers I use is hosted on the Amazon EC2 cloud. Every few months we appear to have a DDOS attack on this sever. This slows the server down incredibly. After around 30 minutes, and sometimes a reboot later, everything is back to normal. Amazon has security groups and firewall, but what else should I have in place on an EC2 server to mitigate or prevent an attack? From similar questions I've learned: Limit the rate of requests/minute (or seconds) from a particular IP address via something like IP tables (or maybe UFW?) Have enough resources to survive such an attack - or - Possibly build the web application so it is elastic / has an elastic load balancer and can quickly scale up to meet such a high demand) If using mySql, set up mySql connections so that they run sequentially so that slow queries won't bog down the system What else am I missing? I would love information about specific tools and configuration options (again, using Linux here), and/or anything that is specific to Amazon EC2. ps: Notes about monitoring for DDOS would also be welcomed - perhaps with nagios? ;)

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• Access an external SSH server through a restrictive proxy [on hold]

  - by Cyrille

  I'm a software developer. I wish to access my computer at home through SSH. For example, I sometime need to access my personal projects source code to check how I handled specific problems. Unfortunately, I currently work under an over-restrictive and anti-productive proxy that waste a hell of a lot of everyone's time (We often have to visit websites from our smartphones or use a web proxy to check very legitimates websites for answers, and don't get me started on other "security" overkill features we have to cope with...). Well, back to the subject, I can access my home computer from my phone (SSH, port 22 and 80 both redirected by router on port 22). It works, but it's quite uncomfortable. From my office computer, this is what I tried so far: export http_proxy=http://user:pass@proxyip:8080 echo "user:pass" > ~/.corkscrew-auth echo "ProxyCommand corkscrew proxyip 8080 %h %p /home/me/.corkscrew-auth" > ~/.ssh/config ssh 82.23.34.56 -l me -p 80 Proxy could not open connnection to 82.23.34.56: Forbidden ssh_exchange_identification: Connection closed by remote host (same without -p 80) Without corkscrew: ssh: connect to host 82.23.34.56 port 80: Connection timed out ssh: connect to host 82.23.34.56 port 22: Connection timed out Any other idea ?

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• Automatically update SVN repository on another server

  - by Mikey C

  We have 2 Ubuntu web servers, one of which is our staging server (Staging) and the other is our live server (Live). Staging has our Subversion repository, as well as the latest version of our sites on it. Because the SVN server is running on Staging, I've added post-commit hook scripts so that the staging server automatically has the latest code. Easy. However, I'd like one of the repositories on Live to also stay updated. This is a repository of images, PDFs and suchlike. When a team member commits to this, I'd like it to automatically update on the live servers so it can be used in mailings, content managed pages etc. I'd add something to the post-commit to SSH across and update, but for security, we can only SSH from one server to another as user 'commandLine', whereas the 'www-data' user runs the post-commit. I'd rather not run a cron on Live to update every 5 minutes, but I can't see another way of doing it without altering all our user permissions. Any ideas?

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• Server format & Reinstall while keeping Server & domain ID

  - by Chris

  Hi Everyone, I want to reinstall my 2008 R2 server from scratch, due to multiple Active Dir issues. I have only 1 server running AD and a spare machine to use if necessary. Is there a way to save just the user accounts and the domain SID, so that I can start with a clean server that uses the same name as before? I can reassign file security, but I do not want to have to rejoin all the users to a new domain. Also all users are mapped to folders on the server. What I hope to do is a clean install of the server without having to mess with the users machines. can someone please tell me the procedure to accomplish this? any help appreciated! Thanks guys, but I could be here all day telling you every error I am getting. can we please keep this to the question of how to do a reinstall and keep the same SID? I just want to start over without having to rejoin all the clients to a new domain. Is there such a tool that can backup the Server SID and the AD domain name so that I could restore them, without restoring any other data? I might not be using the correct terminology here, but hopefully you understand what I am asking. Thanks

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• What are the possible problems, when wget returns code 500 but same request works in normal browsers?

  - by markus

  What should I be looking for, when wget returns 500 but the same URL works fine in my web browser? I don't see any access_log entries that seem to be related to the error. DEBUG output created by Wget 1.14 on linux-gnu. <SSL negotiation info stripped out> ---request begin--- GET /survey/de/tools/clear-caches/password/<some-token> HTTP/1.1 User-Agent: Wget/1.14 (linux-gnu) Accept: */* Host: testing.thesurveylab.net Connection: Keep-Alive ---request end--- HTTP request sent, awaiting response... ---response begin--- HTTP/1.0 500 Internal Server Error Date: Wed, 12 Dec 2012 14:53:07 GMT Server: Apache/2.2.3 (CentOS) Set-Cookie: blueprint2-staging=8jnbmkqapl30hjkgo0u6956pd1; path=/ Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Strict-Transport-Security: max-age=8640000;includeSubdomains X-UA-Compatible: IE=Edge,chrome=1 Content-Length: 5 Connection: close Content-Type: text/html; charset=UTF-8 ---response end--- 500 Internal Server Error Stored cookie testing.thesurveylab.net -1 (ANY) / <session> <insecure> [expiry none] blueprint2-staging 8jnbmkqapl30hjkgo0u6956pd1 Closed 3/SSL 0x0000000001f33430 2012-12-12 15:53:07 ERROR 500: Internal Server Error.

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• Permissions Issue with Files Generated by PerfMon

  - by SvrGuy

  We are trying to implement some data logging to CSV files using a Data Collector Set in PerfMon (on a windows Server 2008R2 system). The issue we are running into is that we (seemingly) can't control the permissions being set on the log files created by perfmon. What we want is for the log files created by perfmon to have Everyone:F permissions (Full Control for Everyone). So, we have a directory structure setup where all logs go into a folder: c:\vms\PerfMonLogs\%MACHINENAME% (e.g. c:\vms\PerfMonLogs\EvaluationG2) In the above example, c:\vms\PerfMonLogs\EvaluationG2 has permissions Everyone:F (below is the icacls for this directory) EVALUATIONG2/ Everyone:(OI)(CI)(F) NT AUTHORITY\SYSTEM:(OI)(CI)(F) BUILTIN\Administrators:(OI)(CI)(F) BUILTIN\Performance Log Users:(OI)(R) When the data collector set runs, it creates new sub folders and files within c:\vms\PerfMonLogs\EvaluationG2, e.g. (C:\vms\PerfMonLogs\EVALUATIONG2\M11d26y2012N3) Each of these directories and files has the following permissions: M11d26y2012N3 NT AUTHORITY\SYSTEM:(OI)(CI)(F) BUILTIN\Administrators:(OI)(CI)(F) BUILTIN\Performance Log Users:(OI)(R) So these new folders and not simply inheriting permissions from the parent folder (don't know why). Now, we tried adding Everyone:F using the security tab on the collector set (No dice). Any ideas? How do we control the permissions on the log files generated by perfmon data collector set?

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• Nginx , Apache , Mysql , Memcache with server 4G ram. How optimize to enought memory?

  - by TomSawyer

  i have 1 dedicated server with Nginx proxy for Apache. Memcache, mysql, 4G Ram. These day, my visitor on my site wasn't increased, but my server get overload always in some specified time. (9AM - 15PM) Ram in use is increased second by second to full. that's moment, my server will get overload. i have to kill all apache , mysql service and reboot it to get free memory. that's the circle. here is my ram in use at the moment 160(nginx) 220(apache) 512(memcache) 924(mysql) here's process number 4(nginx) 14(apache) 5(memcache) 20(mysql) and here's my my.cnf config. someone can help me to optimize it? [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql skip-locking skip-networking skip-name-resolve # enable log-slow-queries log-slow-queries = /var/log/mysql-slow-queries.log long_query_time=3 max_connections=200 wait_timeout=64 connect_timeout = 10 interactive_timeout = 25 thread_stack = 512K max_allowed_packet=16M table_cache=1500 read_buffer_size=4M join_buffer_size=4M sort_buffer_size=4M read_rnd_buffer_size = 4M max_heap_table_size=256M tmp_table_size=256M thread_cache=256 query_cache_type=1 query_cache_limit=4M query_cache_size=16M thread_concurrency=8 myisam_sort_buffer_size=128M # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 [mysqldump] quick max_allowed_packet=16M [mysql] no-auto-rehash [isamchk] key_buffer=256M sort_buffer=256M read_buffer=64M write_buffer=64M [myisamchk] key_buffer=256M sort_buffer=256M read_buffer=64M write_buffer=64M [mysqlhotcopy] interactive-timeout [mysql.server] user=mysql basedir=/var/lib [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid

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• Why does the Mac OS X firewall dialog recurringly pop-up and disappear by itself (without letting me

  - by Chris W. Rea

  From time to time, I'll be on my Macbook using a program that accesses the network – whether Firefox, or Sony's Reader Library – really, it seems like it could happen with any program that accesses the network – and for no reason that I can discern so far (that is, it happens intermittently) the OS X firewall dialog pops up to ask me the question: Except it doesn't actually let me click anything before it disappears! That is: the dialog pops up, ... then goes away by itself a second later, then pops up again, ... then goes away by itself a second later, etc. It happens a few times before stopping. It wouldn't be so maddening to be interrupted if I could just be allowed to click "Allow" and make the darn thing go away for good. In Security preferences I have the firewall turned "On", and I would like to keep it that way. Has anybody seen this problem, found the source, and figured out a solution or workaround? Thank you.

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• Thunderbird 15.0.1 cannot use Exchange 2003 SMTP

  - by speedreeder

  I'm having the strangest time getting a Thunderbird email client to connect to my Exchange 2003 server. I got the incoming IMAP account set up no problem, and I can receive mail. However sending mail will not work no matter what SMTP settings I enter. After checking the server, the proper settings should be port 25 with no authentication or connection security, which I have entered. I can ping the hostname of the server from the client machine in question. The Thunderbird error message I get is: "Sending of message failed. The message could not be sent because the connection to SMTP server -hostname omitted- was lost in the middle of the transaction." So I went to the server and double checked the settings for Exchange's SMTP stuff. I have it correct. I tried to telnet (on the server) to localhost 25. It appears to connect and then disconnect immediately, no message, no nothing. When I telnet to other ports (POP-110 for example) I get proper connection messages and a stable connection. There are no firewalls on either the client or the server. There's a firewall on the network but LAN-LAN traffic is unrestricted. I can reproduce the Thunderbird error on a second client, and I can't get any client to be able to telnet in. Anyone have any ideas?

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• Euro character messed up during FTP transfer

  - by djechelon

  My customer is using a very outdated ecommerce management system on my hosting service. For that product, no support is being provided anymore by the vendor. Brief explanation: the shop website, that claims to run under LAMP stack, is built by an old Visual Basic Windows application running on MS Access. The user constructs the shop, defines the HTML template, adds products and categories, etc. Then the VB exe builds the PHP pages (one for each template page) and the SQL script to run on MySQL. It also uploads everything via FTP and runs the installation/upgrade script on its own. The problem Browsing the website, many products' descriptions are cut before the euro sign. For example, what was supposed to be "Product price €1000" becomes "Product price" The analysis MySQL contains a cutted description until the € sign, so it's not PHP fault The Access databases contain full description with € sign, so it's not fault of the webmaster writing bad description or eDisplay cutting them The SQL that will run once the site gets uploaded, stored on my local machine before upload, contains the € sign The same script, after being FTPed by eDisplay and opened with nano from SSH, shows the € sign messed up like this: ^À vsftpd log reports (obfuscated for privacy) Sat Dec 15 11:16:57 2012 22 xxx.xxx.128.13 1112727 /srv/www/domains/xxxxxx.it/htdocs/db.sql b _ i r xxxxxxx ftp 0 * c which seems to be a binary transfer (and also a huge security vulnerability because you can download the whole database from unauthenticated HTTP) The eDisplay internal FTP client provides no option for ascii/binary transfer modes [Add] Trying to manually upload the SQL file via SFTP shows messing up euro [Add2] Trying to manually upload using Xftp client with explicit ASCII mode doesn't fix too It looks like the file gets uploaded as binary. Perhaps on the customer's previous host it all worked fine because that was a Windows host. The server It's an Azure virtual machine running openSUSE 12.2 with both vsftpd and openSSH The question Without asking the customer to manually upload files using FileZilla or replacing € with &euro;, because he refuses, what can I do on server side to prevent vsftpd to screw up euro sign?

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• MSMQ on Win2008 R2 won't receive messages from older clients

  - by Graffen

  I'm battling a really weird problem here. I have a Windows 2008 R2 server with Message Queueing installed. On another machine, running Windows 2003 is a service that is set up to send messages to a public queue on the 2008 server. However, messages never show up on the server. I've written a small console app that just sends a "Hello World" message to a test queue on the 2008 machine. Running this app on XP or 2003 results in absolutely nothing. However, when I try running the app on my Windows 7 machine, a message is delivered just fine. I've been through all sorts of security settings, disabled firewalls on all machines etc. The event log shows nothing of interest, and no exceptions are being thrown on the clients. Running a packet sniffer (WireShark) on the server reveals only a little. When trying to send a message from XP or 2003 I only see an ICMP error "Port Unreachable" on port 3527 (which I gather is an MQPing packet?). After that, silence. Wireshark shows a nice little stream of packets when I try from my Win7 client (as expected - messages get delivered just fine from Win7). I've enabled MSMQ End2End logging on the server, but only entries from the messages sent from my Win7 machine are appearing in the log. So somehow it seems that messages are being dropped silently somewhere along the route from XP or 2003 to my 2008 server. Does anyone have any clues as to what might be causing this mysterious behaviour? -- Jesper

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• How to configure iptables to use apt-get in a server?

  - by segaco

  I'm starting using iptables (newbie) to protect a linux server (specifically Debian 5.0). Before I configure the iptables settings, I can use apt-get without a problem. But after I configure the iptables, the apt-get stop working. For example I use this script in iptables: #!/bin/sh IPT=/sbin/iptables ## FLUSH $IPT -F $IPT -X $IPT -t nat -F $IPT -t nat -X $IPT -t mangle -F $IPT -t mangle -X $IPT -P INPUT DROP $IPT -P OUTPUT DROP $IPT -P FORWARD DROP $IPT -A INPUT -i lo -j ACCEPT $IPT -A OUTPUT -o lo -j ACCEPT $IPT -A INPUT -p tcp --dport 22 -j ACCEPT $IPT -A OUTPUT -p tcp --sport 22 -j ACCEPT $IPT -A INPUT -p tcp --dport 80 -j ACCEPT $IPT -A OUTPUT -p tcp --sport 80 -j ACCEPT $IPT -A INPUT -p tcp --dport 443 -j ACCEPT $IPT -A OUTPUT -p tcp --sport 443 -j ACCEPT # Allow FTP connections @ port 21 $IPT -A INPUT -p tcp --sport 21 -m state --state ESTABLISHED -j ACCEPT $IPT -A OUTPUT -p tcp --dport 21 -m state --state NEW,ESTABLISHED -j ACCEPT # Allow Active FTP Connections $IPT -A INPUT -p tcp --sport 20 -m state --state ESTABLISHED,RELATED -j ACCEPT $IPT -A OUTPUT -p tcp --dport 20 -m state --state ESTABLISHED -j ACCEPT # Allow Passive FTP Connections $IPT -A INPUT -p tcp --sport 1024: --dport 1024: -m state --state ESTABLISHED -j ACCEPT $IPT -A OUTPUT -p tcp --sport 1024: --dport 1024: -m state --state ESTABLISHED,RELATED -j ACCEPT #DNS $IPT -A OUTPUT -p udp --dport 53 --sport 1024:65535 -j ACCEPT $IPT -A INPUT -p tcp --dport 1:1024 $IPT -A INPUT -p udp --dport 1:1024 $IPT -A INPUT -p tcp --dport 3306 -j DROP $IPT -A INPUT -p tcp --dport 10000 -j DROP $IPT -A INPUT -p udp --dport 10000 -j DROP then when I run apt-get I obtain: core:~# apt-get update 0% [Connecting to ftp.us.debian.org] [Connecting to security.debian.org] [Conne and it stalls. What rules I need to configure to make it works. Thanks

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• How to recover Windows Password without reinstalling if you forgot Windows password?

  - by user38908

  Usually, we can recover Windows admin password in two traditional ways. The first is to change Windows password with another admin account; the second is to recover the previous password with the windows password reset disk that had been created before you forgot the password. Take Windows XP for example, 1 At the Windows XP login prompt when the password is entered incorrectly click the reset button in the login failed window. 2 Insert the password reset diskette into the computer and click Next. 3 If the correct diskette Windows XP will open a window prompting for the new password you wish to use. However, we offen ignore the important of security until we have been locked out of computer. Fortunately, there is still the last way that can unlock your computer without reinstalling - erase Windows password with Windows password reset CD, which can recover admin password for Windows 7/XP/Vista/NT/2000/2003.... Take Windows Password unlocker for example, followings are the steps to create the reset CD 1.Download Windows Password Unlocker from Password Unlocker Official site 2.Decompress the Windows password unlocker and note that there is an .ISO image file. Burn the image file onto an blank CD with the burner freely supported by Password Unlocker. 3.Insert the newly created CD into the locked computer and re-boot it from the CD drive. 4.After launched the CD, a window pop up with all your account names(if you have several accounts) select one of the accounts that you have forgotten its password to reset it. Just one press, this software can remove Windows password instantly.

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• What Logs / Process Stats to monitor on a Ubuntu FTP server?

  - by Adam Salkin

  I am administering a server with Ubuntu Server which is running pureFTP. So far all is well, but I would like to know what I should be monitoring so that I can spot any potential stability and security issues. I'm not looking for sophisticated software, more an idea of what logs and process statistics are most useful for checking on the health of the system. I'm thinking that I can look at various parameters output from the "ps" command and compare to see if I have things like memory leaks. But I would like to know what experienced admins do. Also, how do I do a disk check so that when I reboot, I don't get a message saying something like "disk not checked for x days, forcing check" which delays the reboot? I assume there is command that I can run as a cron job late at night. How often should it be run? What things should I be looking at to spot intrusion attempts? The only shell access is SSH on a non-standard port through UFW firewall, and I regularly do a grep on auth.log for "Fail" or "Invalid". Is there anything else I should look at? I was logging the firewall (UFW) but I have very few open ports (FTP and SSH on a non standard port) so looking at lists of IP's that have been blocked did not seem useful. Many thanks

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