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• Getting 400 Bad Request when requesting by server name on nginx/uwsgi

  - by Marc Hughes

  I'm trying to run 2 different sites on nginx via different ports (they each have a load balancer that points to the appropriate port). The first site work perfectly. The second site... If I access http://localhost:81/ it works correctly If I access http://127.0.01:81/ it works correctly If I access the hostname http://THEHOSTNAME:81/ it fails with a 400 error If I access the public IP http://x.x.x.x:81/ it fails with a 400 error I've set the error_log to info, but the only lines I get in the log when this happens is: ==> /var/log/nginx/access.log <== 10.183.38.141 - - [24/Aug/2014:21:03:28 +0000] "GET / HTTP/1.1" 400 37 "-" "curl/7.36.0" "-" ==> /var/log/nginx/error.log <== 2014/08/24 21:03:28 [info] 7029#0: *5 client 10.183.38.141 closed keepalive connection In my uwsgi log, I only see this: [pid: 6870|app: 0|req: 87/92] 10.28.23.224 () {32 vars in 380 bytes} [Sun Aug 24 21:05:21 2014] GET / => generated 26 bytes in 1 msecs (HTTP/1.1 400) 2 headers in 82 bytes (1 switches on core 2) What should be my next step in debugging this?

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• Can't setup 3 nodes MongoDB recplica set

  - by Victor Lin

  I just follow instructions in MongoDB document Replica Sets - Basics to setup a 3-node Replica set. Everything goes fine when I do the initiate and add first node in the primary. [foo@host-a mongodb]$ bin/mongo localhost MongoDB shell version: 1.8.2 connecting to: localhost > rs.initiate() { "info2" : "no configuration explicitly specified -- making one", "info" : "Config now saved locally. Should come online in about a minute.", "ok" : 1 } > rs.add("host-b") { "ok" : 1 } So far so good, but when I try to add third node myset:PRIMARY> rs.addArb("host-c") Sun Aug 7 22:57:09 MessagingPort recv() errno:104 Connection reset by peer 127.0.0.1:27017 Sun Aug 7 22:57:09 SocketException: remote: error: 9001 socket exception [1] Sun Aug 7 22:57:09 DBClientCursor::init call() failed Sun Aug 7 22:57:09 query failed : local.$cmd { count: "system.replset", query: {}, fields: {} } to: 127.0.0.1 Sun Aug 7 22:57:09 Error: error doing query: failed shell/collection.js:150 Sun Aug 7 22:57:09 trying reconnect to 127.0.0.1 Sun Aug 7 22:57:09 reconnect 127.0.0.1 ok As result, the current primary became secondary, and the host-b was marked as dead, but actually, it is still alive. myset:SECONDARY> rs.status() { "set" : "myset", "date" : ISODate("2011-08-08T04:03:23Z"), "myState" : 2, "members" : [ { "_id" : 0, "name" : "host-a:27017", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "optime" : { "t" : 1312775799000, "i" : 1 }, "optimeDate" : ISODate("2011-08-08T03:56:39Z"), "self" : true }, { "_id" : 1, "name" : "host-b", "health" : 0, "state" : 6, "stateStr" : "(not reachable/healthy)", "uptime" : 0, "optime" : { "t" : 0, "i" : 0 }, "optimeDate" : ISODate("1970-01-01T00:00:00Z"), "lastHeartbeat" : ISODate("2011-08-08T04:03:22Z"), "errmsg" : "still initializing" } ], "ok" : 1 } How could this happen? I just follow the guide in the document, did I do something wrong? Moreover, I can't do anything on current secondary server. It doesn't allow me to reconfig on the secondary node, but the problem is there is no primary node. myset:SECONDARY> rs.reconfig({}) { "errmsg" : "replSetReconfig command must be sent to the current replica set primary.", "ok" : 0 } Any ideas?

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• Chunking large rsync transfers?

  - by Gabe Martin-Dempesy

  We use rsync to update a mirror of our primary file server to an off-site colocated backup server. One of the issues we currently have is that our file server has 1TB of mostly smaller files (in the 10-100kb range), and when we're transferring this much data, we often end up with the connection being dropped several hours into the transfer. Rsync doesn't have a resume/retry feature that simply reconnects to the server to pickup where it left off -- you need to go through the file comparison process, which ends up being very length with the amount of files we have. The solution that's recommended to get around is to split up your large rsync transfer into a series of smaller transfers. I've figured the best way to do this is by first letter of the top-level directory names, which doesn't give us a perfectly even distribution, but is good enough. I'd like to confirm if my methodology for doing this is sane, or if there's a more simple way to accomplish the goal. To do this, I iterate through A-Z, a-z, 0-9 to pick a one character $prefix. Initially I was thinking of just running rsync -av --delete --delete-excluded --exclude "*.mp3" "src/$prefix*" dest/ (--exclude "*.mp3" is just an example, as we have a more lengthy exclude list for removing things like temporary files) The problem with this is that any top-level directories in dest/ that are no longer present present on src will not get picked up by --delete. To get around this, I'm instead trying the following: rsync \ --filter 'S /$prefix*' \ --filter 'R /$prefix*' \ --filter 'H /*' \ --filter 'P /*' \ -av --delete --delete-excluded --exclude "*.mp3" src/ dest/ I'm using the show and hide over include and exclude, because otherwise the --delete-excluded will delete anything that doesn't match $prefix. Is this the most effective way of splitting the rsync into smaller chunks? Is there a more effective tool, or a flag that I've missed, that might make this more simple?

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• DNAT to 127.0.0.1 with iptables / Destination access control for transparent SOCKS proxy

  - by cdauth

  I have a server running on my local network that acts as a router for the computers in my network. I want to achieve now that outgoing TCP requests to certain IP addresses are tunnelled through an SSH connection, without giving the people from my network the possibility to use that SSH tunnel to connect to arbitrary hosts. The approach I had in mind until now was to have an instance of redsocks listening on localhost and to redirect all outgoing requests to the IP addresses I want to divert to that redsocks instance. I added the following iptables rule: iptables -t nat -A PREROUTING -p tcp -d 1.2.3.4 -j DNAT --to-destination 127.0.0.1:12345 Apparently, the Linux kernel considers packets coming from a non-127.0.0.0/8 address to an 127.0.0.0/8 address as “Martian packets” and drops them. What worked, though, was to have redsocks listen on eth0 instead of lo and then have iptables DNAT the packets to the eth0 address instead (or using a REDIRECT rule). The problem about this is that then every computer on my network can use the redsocks instance to connect to every host on the internet, but I want to limit its usage to a certain set of IP addresses only. Is there any way to make iptables DNAT packets to 127.0.0.1? Otherwise, does anyone have an idea how I could achieve my goal without opening up the tunnel to everyone? Update: I have also tried to change the source of the packets, without any success: iptables -t nat -A POSTROUTING -p tcp -s 192.168.1.0/24 -d 1.2.3.4 -j SNAT --to-source 127.0.0.1 iptables -t nat -A POSTROUTING -p tcp -s 192.168.1.0/24 -d 127.0.0.1 -j SNAT --to-source 127.0.0.1

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• How to run some commands after booting from ArchLinux disk? Or how to change some settings in .iso before booting?

  - by Alexander Ovchinnikov

  How to install Arch Linux with traditional installer with only ssh-access to server? There is nice guide: https://wiki.archlinux.org/index.php/Install_from_SSH I try test this on my home vps: Start VPS with any linux bootable cd and login to remote server (vps) wget http://mirrors.kernel.org/archlinux/iso/latest/archlinux-2010.05-netinstall-x86_64.iso dd if=archlinux-2010.05-netinstall-x86_64.iso of=/dev/sda reboot ... I see, it works but without ssh connection... I need make script, which will send this commands after reboot: aif -p partial-configure-network (and write some information about my server ip etc.) /etc/rc.d/sshd start (need to start sshd) echo "sshd: ALL" /etc/hosts.allow (to allow me login to server, by default deny all) passwd (by default its empty, can't login via ssh with empty password) Can I edit .iso or may be /dev/sda? May be I need write script, which will start after system boot and do this things or may be I can set this settings by default and system will start with correct settings (i think its possible at least in 2. and 3.). Thank you!

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• How to inspect remote SMTP server's TLS certificate?

  - by Miles Erickson

  We have an Exchange 2007 server running on Windows Server 2008. Our client uses another vendor's mail server. Their security policies require us to use enforced TLS. This was working fine until recently. Now, when Exchange tries to deliver mail to the client's server, it logs the following: A secure connection to domain-secured domain 'ourclient.com' on connector 'Default external mail' could not be established because the validation of the Transport Layer Security (TLS) certificate for ourclient.com failed with status 'UntrustedRoot. Contact the administrator of ourclient.com to resolve the problem, or remove the domain from the domain-secured list. Removing ourclient.com from the TLSSendDomainSecureList causes messages to be delivered successfully using opportunistic TLS, but this is a temporary workaround at best. The client is an extremely large, security-sensitive international corporation. Our IT contact there claims to be unaware of any changes to their TLS certificate. I have asked him repeatedly to please identify the authority that generated the certificate so that I can troubleshoot the validation error, but so far he has been unable to provide an answer. For all I know, our client could have replaced their valid TLS certificate with one from an in-house certificate authority. Does anyone know a way to manually inspect a remote SMTP server's TLS certificate, as one can do for a remote HTTPS server's certificate in a web browser? It could be very helpful to determine who issued the certificate and compare that information against the list of trusted root certificates on our Exchange server.

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• ASP.NET Website Administration Tool: Unable to connect to SQL Server database

  - by MedicineMan

  I am trying to get authentication and authorization working with my ASP MVC project. I've run the aspnet_regsql.exe tool without any problem and see the aspnetdb database on my server (using the Management Studio tool). my connection string in my web.config is: <connectionStrings> <add name="ApplicationServices" connectionString="data source=MYSERVERNAME;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient" /> The error I get is: There is a problem with your selected data store. This can be caused by an invalid server name or credentials, or by insufficient permission. It can also be caused by the role manager feature not being enabled. Click the button below to be redirected to a page where you can choose a new data store. The following message may help in diagnosing the problem: Unable to connect to SQL Server database. In the past, I have had trouble connecting to my database because I've needed to add users. Do I have to do something similar here?

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• HP ProCurve & Cisco switches interoperability

  - by Kamil Z

  I have a couple of questions regarding Cisco and HP ProCurve interoperability. Here's a link to pdf with my network topology. Can someone help me with basic VLAN configuration in such topology? Below there are some details of my configuration: # m_management_2 interface FastEthernet0/43 switchport access vlan 250 switchport mode access spanning-tree port-priority 32 spanning-tree cost 100 # MTA2-swmgmt1 vlan 1 name "DEFAULT_VLAN" untagged 1-48 ip address 10.10.249.190 255.255.255.128 exit # MTA2-swtr1 vlan 1 name "DEFAULT_VLAN" untagged 1-14,16-48 no ip address no untagged 15 exit vlan 100 name "MTA Mgmt" untagged 15 ip address 10.10.249.188 255.255.255.128 exit # MTA2-swtr2 vlan 1 name "DEFAULT_VLAN" untagged 1-14,16-48 no ip address no untagged 15 exit vlan 100 name "MTA Mgmt" untagged 15 ip address 10.10.249.189 255.255.255.128 exit I don't post MTA2-bcsw[12] configuration, because I wasn's successfull in this one yet. Every time I configure VLANs on MTA2-bcsw[12] Fa0/24 interface on m_management_2 goes down bacause of receiving tagged BPDUs on access port (there are no VLANs configured on MTA2-swmgmt1 because of fact that only 250 VLAN is allowed in this switch. Is it correct?). Can someone provide me some basic configuration for this topology? Second thing I want to ask is concept of connection from MTA2-swmgmt1 to MTA2-swtr[12] HP switches for the sake of management. How to configure such ports on HP switches (managed switch and manager switch). Is my actual configuration correct?

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• How does it hurt to use Linux (Ubuntu) as a guest OS for all my tasks?

  - by sauparna

  I have a machine running Windows, where the disk has two partitions C (50 GB) and D (250GB). I do research in Information Retrieval and need to work with a large corpus (more than 50 GB) and in Linux. So if I want to install Linux on the existing system, keeping the Windows installation intact, will it be fine to run it in a virtual box? (say, QEMU, VMWare, etc.) An alternative is using Wubi. In that case the Linux installation has to be on drive C. Then, if I keep a small Linux installation (say 5GB) on C, and my corpus on D (mounted in Linux), how will it affect the performance of my programs which would be accessing the mounted Windows drive D. Is it feasible to use Linux this way? Which of the above is better if at all they are a way out? Note : Since my post in July 2010, I have been using and have tried several ways of maintaining a disk-image that I can mount in Linux. I had a 100GB qcow2 disk and a 100GB raw disk, both formatted to an EXT3 file system. I was mounting and connecting to the qcow2 disk using qemu-nbd. The problem was that every now and then, the connection to the disk would get lost and the running programs would throw disk I/O errors. The raw disk would mount and work fine as a loop mounted device, but when writing data to it, the mount.ntfs program would hog the CPU and the process would take an enormous amount of time. I was in fact running make on a piece of software located on this raw disk, and after a point of time make was waiting while mount.ntfs would show 100% CPU usage.

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• Virtual Machines Renaming/Backing up/Sharing

  - by evan

  I've started using VMware virtual machines for all of my software development projects and have a few questions for others doing the same thing. First, how can you rename the virtual machine and the name of the virtual hard drive? I have a base development machine that I clone for different projects. I'd like to name the machine and it's hard drive according the the project (right now when I copy them via cut and paste, the file names remain the same and I can only organize them by putting them in a specific directory). Second, what is the best way to back up a virtual machine? Is it possible (by breaking the virtual hard drive up into chunks instead of one big file) to get incremental backups working? It seems time machine always tries to make a copy of the whole thing which is time consuming because each virtual machine is around 30GB. Finally, how slow would it be to have a virtual machine shared on an NFS mount on a wireless N network and used from multiple computers (but with only one person using it at a time.) Would it be more reasonable on a gigabit lan connection? Thanks for your input! And please feel free to share any advice or wisdom about using virtual machines for software development and the best ways to speed them up!

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• Asus WL-520GU conflicting subnet (and/or IP) with 2Wire DSL

  - by Paula

  I have an Asus wireless router: WL-520GU... and an AT&T 2Wire for my DSL connection. When I try to browse anywhere, I just get an odd message from the Asus router (in the common Asus broken-English, bad formatting, and awful spelling): http://postimage.org/image/upxrjflcj I guess it's trying to say: Your Asus Router and your 2Wire have the same subnet mask. (It doesn't say if that's good, or bad... but it sounds like they must be different.) but... But for the "solution" it looks like it's trying to say: Your Asus Router and your 2Wire have the same IP address. My Asus has the defaults: 192.168.1.1 and 255.255.255.0 My 2Wire has: 192.168.1.66 I'm not seeing where the conflict(s) could be. The Asus firmware is v3.0.0.14 . None of these problems occur with the old v3.0.0.8 firmware. Any ideas on how to fix this? (PLEASE don't say to run a totally different DD/Tomato firmware because it's "better". I need to fix THIS 1 problem, not try to convince my company to switch everything to an entirely different set of problems.)

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• Apache mod-pagespeed installation affects mod-spdy?

  - by tim peterson

  Recently my site (an https connection, running on an Amazon EC2 ubuntu apache2.2) has this issue where I need to load the page several times (3-4) before it will load normally without issue. It will then load normally as long as I keep loading pages regularly (every couple seconds). It will stall again if I don't load pages for a few minutes. It has nothing to do with my application because I don't have this problem with the exact same app codebase on my Apache installation on my laptop. The only things to my knowledge that I've changed is that I recently installed mod_spdy and then a few weeks later I installed mod_pagespeed, https://developers.google.com/speed/pagespeed/mod. However, I have since turned mod_pagespeed off by setting its pagespeed.conf to mod_pagespeed off. Unfortunately, that didn't solve the problem. The line below is how every of last 10 lines of my error.log look: # tail -f /var/log/apache2/error.log ... [32728:32729:ERROR:mod_spdy.cc(162)] request->chunked == 1 in request GET / HTTP/1.1 [Sat Jun 02 04:50:08 2012] [warn] [client 50.136.93.153] [stream 5] [32728:32729:WARNING:http_to_spdy_filter.cc(113)] HttpToSpdyFilter is not the last filter in the chain: chunk any thoughts? thank you, tim

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• Catastrophic Failure opening ODBC via Citrix

  - by Joshdan

  We recently had our Citrix server crash unexpectedly. When it came back up, there was a new issue -- every ODBC connection fails with "Catastrophic Failure" (0x8000FFFF). The issue is limited to Citrix / ICA connections; logging in as the same user via RDP works as usual. The following code is my minimal test case (for wscript): ''// test_odbc.vbs strConn = "Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=c:\files\;" Set rs = CreateObject("ADODB.recordset") strSQL = "SELECT * FROM myFile.csv" wscript.echo "Press OK to Test" ''// This line breaks over Citrix, but not over Terminal Services ''// ---------------------- rs.open strSQL, strConn, 3,3 ''// ---------------------- wscript.echo rs("a") Any insight would be greatly appreciated. Windows Server 2003 SP1, Citrix MetaFrame Presentation Server 4.0. Clients include at least versions 10.2-11 running on 2000-Vista, OS X. ODBC error happens whether a DSN is used or not, on at least Access, MS-SQL, and CSV. Connections both through the SSL Gateway and directly. There have been a few users actually able to log in without trouble, but I can't pin down anything special about them.

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• Windows Server 2008 DHCP with RRAS

  - by Guillermo Prandi

  I have a Windows Server 2008 R2 which is a member of a domain, but is placed in a remote location. The server is directly connected to Internet. Clients need to access a particular insecure TCP service in this server (ports 9730 and 9731). Since clients have dynamic IP addresses I cannot know in advance, I thought it would be nice to have them connected through a VPN in order to access the insecure service, but ONLY to access that service, like this: Client ------> VPN TUNNEL ------> (Insecure service at Server) | \----> (Normal internet access) I'd enable the insecure ports in the firewall only from VPN accesses. For this I configured RRAS in the server and gave it a static IP address range (172.19.1.2 through 172.19.1.254) to serve the clients. First I thought I could use DHCP to assign the addresses, but I cannot use DHCP in my LAN connection (not allowed by the hosting service). I tried configuring DHCP binding it to a Microsoft Loopback Adapter, but that's not supported as a DHCP source by RRAS. What I want to accomplish is to send specific DHCP options to the client (network mask, routing table, etc.). In particular: Prevent the client from having the server as default router (without changing the client's "use default gateway in remote network"). Have it as a route for the server's internal RRAS address only (172.19.1.1). Prevent the client from using a 255.255.0.0 mask for the 172.19.x.x network (a 255.255.255.0 mask would be better). Can I do that with RRAS only? How? Currently, the only solution I can think of is to use DHCP in the LAN adapter, but filter DHCP packets so they don't reach the provider's network. However, I'm not sure if that will work. Any suggestions are welcomed! Guille

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• How do I improve my incremental-backup performance?

  - by Alistair Bell

  I'm currently using the traditional rsync+cp -al method to create incremental/snapshot backups of our server tree. The backups are going onto a pair of eight-disk towers connected to the backup machine (a Sandy Bridge machine with 16 GB of RAM, running CentOS 5.5) via four eSATA connections (four disks per connection). Each disk is a regular 2 TB disk, so we have 32 TB of disk space connected to the backup machine. We're backing up about 20 TB of data on the servers with this. The problem is that each daily backup is taking more than 24 hours, and the real time-killer isn't the actual rsync, but the time it takes to perform a cp -al of the tree locally on the backup machine. It's taking more than 12 hours just to make the shadow copy of the tree, and as far as I can tell the performance backlog is at the disk (top shows the cp using a lot of RAM but not a lot of CPU and mostly in uninterruptible-sleep state) We have the server data split into four major volumes (and a few minor ones), and each of these backups runs in parallel (with some offsets in the cron to try to get some disks' cp done first). There are two volumes on the backup drive, both striped LVM volumes of 16 TB each. So obviously I need to improve the performance because it's unusable as it stands. The first question is: when CentOS 6 comes out, with support for btrfs, will making snapshots of subvolumes with btrfs substantially increase this performance? The second is: is there a way, with ext3 or something else supported in CentOS 5 or 6, to 'encourage' it to put the directories/inodes in one part of a volume (which could happen to be the part that's on an SSD, via LVM) and the files in another? That would presumably solve the problem, but I don't know of ways to hint ext3 like that.

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• Postgresql server will not start

  - by Claudiu

  I'm on Windows 7. I restarted my computer. I then tried to connect to the database and got an error. I don't remember which one in particular but it was some connection issue. I decided to try to restart the server, so I clicked on "Restart server" from the start menu. This blocked. After a few minutes I killed the process and tried again, only to get a "The service is starting or stopping. Please try again later." message. I rebooted the computer again, tried to start again, and got the same error. I killed the pg_ctl process and tried starting it manually, but that didn't work either: C:\Users\DrClaud>cscript "C:\Program Files\PostgreSQL\8.3\scripts\serverctl.vbs" start wait Microsoft (R) Windows Script Host Version 5.8 Copyright (C) Microsoft Corporation. All rights reserved. The PostgreSQL Server 8.3 service is starting................................... ....................................... The PostgreSQL Server 8.3 service could not be started. The service did not report an error. More help is available by typing NET HELPMSG 3534. The start command returned an error (2) Any ideas?

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• can't find port 22 traffic under VirtualBox

  - by telliott99

  I'm trying to learn to use tcpdump. I thought I'd eavesdrop on my ssh login. The setup is a bit unusual, I have OS X Lion running VirtualBox, with Ubuntu running in the VM. I have ssh enabled and can login from OS X normally: > ssh -p 22 10.0.1.2 -l telliott Welcome to Ubuntu 11.10 (GNU/Linux 3.0.0-17-generic i686) * Documentation: https://help.ubuntu.com/ 0 packages can be updated. 0 updates are security updates. Last login: Sat Mar 31 19:54:36 2012 from toms-mac-mini.local telliott@U32:~$ logout Connection to 10.0.1.2 closed. > I have not obfuscated the ssh port on Ubuntu. From OS X, stroke gives what I expect: > ./stroke 10.0.1.2 22 22 Port Scanning host: 10.0.1.2 Open TCP Port: 22 ssh So from OS X I do: > sudo tcpdump -i en1 -v port 22 Password: tcpdump: listening on en1, link-type EN10MB (Ethernet), capture size 65535 bytes Then I login from OS X to Ubuntu using ssh, but I see nothing with tcpdump. Here is ifconfig from Ubuntu: telliott@U32:~$ ifconfig eth1 Link encap:Ethernet HWaddr 08:00:27:d7:ba:0e inet addr:10.0.1.2 Bcast:10.0.1.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fed7:ba0e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:799 errors:0 dropped:0 overruns:0 frame:0 TX packets:465 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:96863 (96.8 KB) TX bytes:68638 (68.6 KB) Where are the packets I was hoping to see? Thanks for any help.

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• Problems configuring DB2 CLI/ODBC System DSN ODBC Data Source Administrator

  - by Komyg

  I am trying to create a System DSN ODBC connection to a DB2 9.5 database, but I am getting a very strange problem. I've looked through the internet and found the following page that has some instructions on how I should proceed: http://www.ryslander.com/how-to-install-and-configure-db2-odbc-driver/. I followed these instructions and I am able to create a new System DSN, however when I try to configure it it seems as if my configurations don't work at all. For example, when I click on the "Configure" button on my System DSN and I add a TCP/IP protocol configuration on the "Advanced Settings" tab and click "Ok", no errors appear, but when I click on "Configure" again my TCP/IP setting has vanished. This happened to all my other configurations, such as database name, username, password etc. Could you help me figure out what I am doing wrong? Note: my user is in the administrator group and I am using a Windows Server 2008 R2 Enterprise x64. UPDATE I managed to create a User DSN and connect to the database. However the problem with the System DSN remains.

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• How to tunnel a local port onto a remote server

  - by Trevor Rudolph

  I have a domain that i bought from DynDNS. I pointed the domain at my ip adress so i can run servers. The problem I have is that I don't live near the server computer... Can I use an ssh tunnel? As I understand it, this will let me access to my servers. I want the remote computer to direct traffic from port 8080 over the ssh tunnel to the ssh client, being my laptop's port 80. Is this possible? EDIT: verbose output of tunnel macbookpro:~ trevor$ ssh -R *:8080:localhost:80 -N [email protected] -v OpenSSH_5.2p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /Users/trevor/.ssh/config debug1: Reading configuration data /etc/ssh_config debug1: Connecting to site.com [remote ip address] port 22. debug1: Connection established. debug1: identity file /Users/trevor/.ssh/identity type -1 debug1: identity file /Users/trevor/.ssh/id_rsa type -1 debug1: identity file /Users/trevor/.ssh/id_dsa type 2 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr 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 'site.com' is known and matches the RSA host key. debug1: Found key in /Users/trevor/.ssh/known_hosts:9 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,password debug1: Next authentication method: publickey debug1: Trying private key: /Users/trevor/.ssh/identity debug1: Trying private key: /Users/trevor/.ssh/id_rsa debug1: Offering public key: /Users/trevor/.ssh/id_dsa debug1: Authentications that can continue: publickey,password debug1: Next authentication method: password [email protected]'s password: debug1: Authentication succeeded (password). debug1: Remote connections from *:8080 forwarded to local address localhost:80 debug1: Requesting [email protected] debug1: Entering interactive session. debug1: remote forward success for: listen 8080, connect localhost:80 debug1: All remote forwarding requests processed

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• SqlCmd : Login timeout expired from localhost

  - by mschr

  I've setup the instance SQLEXPRESS via SQL Server 2008 R2 installation, added a security login with all server roles, one called 'sqluser'. The server authentication is SQL Server and Windows Authentication mode. However, when i specify the -S property, login fails. There is no firewall enabled and SQL server even accepts connections from remote hosts. C:\Users\user>sqlcmd -U sqluser -P qwerty -Q "Select * FROM testdb.dbo.testtable" Output: integer ------- 1 2 3 4 (4 rows affected) However when specifying 'localhost' the query fails... Question is Why? C:\Users\user>sqlcmd -S localhost/sqlexpress -U cpt -P 1234 -Q "Select * FROM cpt.dbo.testme" Output: HResult 0x43, Level 16, State 1 Named Pipes Provider: Could not open a connection to SQL Server [67]. Sqlcmd: Error: Microsoft SQL Server Native Client 10.0 : A network-related or in stance-specific error ..... Sqlcmd: Error: Microsoft SQL Server Native Client 10.0 : Login timeout expired. Changing 'localhost' with '%COMPUTERNAME' is same result if someone would be wondering. The server is running as a LocalSystem instance.

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• Vmware Player 3.0 - cannot ping 32 bits guest from 64 bits (guest or host)

  - by npmj

  I'm stuck with what seems a bug in VmWare Player (build 203739). I'm using W7 Ultimate 64bits as host and have a CentOS 5.4 (64 bits) as a guest and a Windows XP Professional SP3 (32 bits) as another guest. From the 64 bits machines (the host and the linux guest) I cannot ping the windows XP. Off course, I already turned off the windows firewall in the guest and also in the host. The network is pretty basic, I'm using Vmnet8 (NAT), with DHCP and port forwarding (to the windows XP's IP). Everything is working ok, I have internet access from host and from both guests. Port forwarding to the XP guest is working ok too. The only problem is that I cannot access the XP guest through the Vmnet8. I monitored the traffic using wireshark (in the host and in the windows guest). If I try to ping the XP guest from the host, what I see is the ARP request leaving the host, being answered by the guest and, after that, there is no echo request leaving the host. The same occurs if I try to ping the XP from the CentOs guest. From the windows XP guest I can ping both the host and the CentOs guest. From the XP guest I can access the host shares. Obviously, from the host I cannot see the XP shares (as I cannot even ping the guest). I want to maintain this setup (using NAT to share the host's internet connection). Any suggestions?

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• Improving Performance of RDP Over LAN

  - by Jared Brown

  Architecture: A deployment of 6 new HP thin clients (Windows XP Embedded) with TCP/IP access to several new HP servers (Windows 2003 Server). Each thin client is connected over fiber optic to a Gigabit Cisco switch, which the servers are connected to. There are 10/100 Ethernet to fiber converter boxes on each end of the fiber cables. Problem: Noticeable lag over RDP while using the Unigraphics CAD package. 3D models take .5 to 1 second to respond to mouse actions. Other Details: Network throughput on each thin client's RDP session is 7288 kbps. RDP connection settings - color setting: 15k, all themes, etc. turned off. Local and remote system performance stats are well within norms (CPU, Memory, and Network). Question: Are there newer versions of terminal services or RDP I can use on my existing OSes? Are there compression algorithms, etc. that are well suited for a high-bandwidth LAN? Are there valid alternatives that will yield higher performance (i.e. UltraVNC with drivers installed)? Are there TCP/IP tuning options I can exploit?

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• Website does not resolve in browser but traceroute is successful

  - by Colum

  I am trying to figure out an issue. My internet is working fine, but this one website is not resolving. It works via a proxy, traceroute works: 1 192.168.1.1 (192.168.1.1) 4.205 ms 0.568 ms 0.510 ms 2 * * * 3 67.59.255.13 (67.59.255.13) 10.583 ms 7.949 ms 7.557 ms 4 67.59.255.61 (67.59.255.61) 10.256 ms 9.576 ms 13.083 ms 5 64.15.8.126 (64.15.8.126) 9.943 ms 11.929 ms 11.452 ms 6 64.15.0.217 (64.15.0.217) 14.655 ms 14.092 ms 13.771 ms 7 64.15.0.118 (64.15.0.118) 33.201 ms 34.875 ms 36.544 ms 8 xe-6-0-3.ar1.ord1.us.nlayer.net (69.31.111.169) 34.027 ms 34.957 ms 34.231 ms 9 ae1-30g.cr1.ord1.us.nlayer.net (69.31.111.133) 82.683 ms 35.138 ms 37.592 ms 10 xe-3-0-0.cr2.iad1.us.nlayer.net (69.22.142.26) 41.657 ms 34.063 ms 34.519 ms 11 ae2-30g.ar2.iad1.us.nlayer.net (69.31.31.186) 35.780 ms 36.361 ms 33.968 ms 12 as33597.xe-3-0-7.ar2.iad1.us.nlayer.net (69.31.30.230) 35.086 ms as33597.xe-3-0-7.ar2.iad1.us.nlayer.net (69.31.30.234) 38.031 ms as33597.xe-3-0-7.ar2.iad1.us.nlayer.net (69.31.30.230) 36.833 ms 13 cr1.iad2.inforelay.net (66.231.176.246) 32.595 ms cr2.iad1.inforelay.net (66.231.176.10) 31.771 ms cr1.iad2.inforelay.net (66.231.176.246) 32.622 ms 14 cr1.iad2.inforelay.net (66.231.176.246) 32.956 ms 33.625 ms !X 41.058 ms 15 * cr1.iad2.inforelay.net (66.231.176.246) 35.312 ms !X * 16 * cr1.iad2.inforelay.net (66.231.176.246) 32.814 ms !X * 17 cr1.iad2.inforelay.net (66.231.176.246) 35.459 ms !X * 53.137 ms !X Ping returns this: Request timeout for icmp_seq 0 Request timeout for icmp_seq 1 Request timeout for icmp_seq 2 Request timeout for icmp_seq 3 Request timeout for icmp_seq 4 Request timeout for icmp_seq 5 Request timeout for icmp_seq 6 But what I can not figure out is why my browsers (Firefox, Safari, Opera) can not resolve the domain. I am on a Wifi connection. What could be the problem? BTW I am on a Mac (10.6.5)

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• Website does not resolve in browser but traceroute is successful

  - by Colum

  I am trying to figure out an issue. My internet is working fine, but this one website is not resolving. It works via a proxy, traceroute works: 1 192.168.1.1 (192.168.1.1) 4.205 ms 0.568 ms 0.510 ms 2 * * * 3 67.59.255.13 (67.59.255.13) 10.583 ms 7.949 ms 7.557 ms 4 67.59.255.61 (67.59.255.61) 10.256 ms 9.576 ms 13.083 ms 5 64.15.8.126 (64.15.8.126) 9.943 ms 11.929 ms 11.452 ms 6 64.15.0.217 (64.15.0.217) 14.655 ms 14.092 ms 13.771 ms 7 64.15.0.118 (64.15.0.118) 33.201 ms 34.875 ms 36.544 ms 8 xe-6-0-3.ar1.ord1.us.nlayer.net (69.31.111.169) 34.027 ms 34.957 ms 34.231 ms 9 ae1-30g.cr1.ord1.us.nlayer.net (69.31.111.133) 82.683 ms 35.138 ms 37.592 ms 10 xe-3-0-0.cr2.iad1.us.nlayer.net (69.22.142.26) 41.657 ms 34.063 ms 34.519 ms 11 ae2-30g.ar2.iad1.us.nlayer.net (69.31.31.186) 35.780 ms 36.361 ms 33.968 ms 12 as33597.xe-3-0-7.ar2.iad1.us.nlayer.net (69.31.30.230) 35.086 ms as33597.xe-3-0-7.ar2.iad1.us.nlayer.net (69.31.30.234) 38.031 ms as33597.xe-3-0-7.ar2.iad1.us.nlayer.net (69.31.30.230) 36.833 ms 13 cr1.iad2.inforelay.net (66.231.176.246) 32.595 ms cr2.iad1.inforelay.net (66.231.176.10) 31.771 ms cr1.iad2.inforelay.net (66.231.176.246) 32.622 ms 14 cr1.iad2.inforelay.net (66.231.176.246) 32.956 ms 33.625 ms !X 41.058 ms 15 * cr1.iad2.inforelay.net (66.231.176.246) 35.312 ms !X * 16 * cr1.iad2.inforelay.net (66.231.176.246) 32.814 ms !X * 17 cr1.iad2.inforelay.net (66.231.176.246) 35.459 ms !X * 53.137 ms !X Ping returns this: Request timeout for icmp_seq 0 Request timeout for icmp_seq 1 Request timeout for icmp_seq 2 Request timeout for icmp_seq 3 Request timeout for icmp_seq 4 Request timeout for icmp_seq 5 Request timeout for icmp_seq 6 But what I can not figure out is why my browsers (Firefox, Safari, Opera) can not resolve the domain. I am on a Wifi connection. What could be the problem? BTW I am on a Mac (10.6.5)

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• How much network latency is "typical" for east - west coast USA?

  - by Jeff Atwood

  At the moment we're trying to decide whether to move our datacenter from the west coast (Corvallis, OR) to the east coast (NY, NY). However, I am seeing some disturbing latency numbers from my location (Berkeley, CA) to the NYC host. Here's a sample result, retrieving a small .png logo file in Google Chrome and using the dev tools to see how long the request takes: Berkeley to NYC server: 215 ms latency, 46ms transfer time, 261ms total Berkeley to Corvallis server: 114ms latency, 41ms transfer time, 155ms total some URLs if you want to try yourself: http://careers.stackoverflow.com/content/cso/img/logo.png (NY, NY) http://serverfault.com/cache/logo.png (Corvallis, OR) It makes sense that Corvallis, OR is geographically closer to Berkeley, CA so I expect the connection to be a bit faster.. but I'm seeing an increase in latency of +100ms when I perform the same test to the NYC server. That seems .. excessive to me. Particularly since the time spent transferring the actual data only went up 10%, yet the latency went up ten times as much! That feels... wrong... to me. I found a few links here that were helpful (through Google no less!) ... http://serverfault.com/questions/63531/does-routing-distance-affect-performance-significantly http://serverfault.com/questions/61719/how-does-geography-affect-network-latency http://serverfault.com/questions/6210/latency-in-internet-connections-from-europe-to-usa ... but nothing authoritative. So, is this normal? It doesn't feel normal. What is the "typical" latency I should expect when moving network packets from the east coast <--> west coast of the USA?

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