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• forward ssh ports on EC2

  - by Will Glass

  I have an SSH server on a private subnet within an EC2 vpc listening for ssh on port 9022 I also have a nat instance (standard Amazon EC2 nat) on a public instance. I would like to forward incoming SSH connections (port 9022) to my nat to the internal server (port 9022). I tried this, but it didn't work: sudo iptables -t nat -I PREROUTING -p tcp -i eth0 --dport 9022 -j DNAT --to-destination 10.0.2.11:9022 I verified that 10.0.2.11 is listening on port 9022. (I can telnet). I verified my security group allows incoming port 9022. I verified that /proc/sys/net/ipv4/ip_forward is 1. What am I missing? Edit: Turns out this was correct after all. I had a mistake in my security group.

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• Where should I go to learn about networking? [closed]

  - by Ollie Saunders

  I wonder if anyone could recommend resource or resources such as a good book that: explains how all the important protocols work and interact. I’m interested in those that are relevant in a typical home network and used over the Internet explains in detail how ADSL Internet connections work to the level of depth necessary so that I’m able to tweak and measure performance settings starts from the beginning but attempts to provide proper understanding rather than idiot-oriented steps to follow Basically, I’m interested in how these technologies work and tend to be implemented in hardware and software rather than “here’s what to do if…” I’m interested in Computer Networking by Andrew S. Tanenbaum and I wonder if anyone else has any experience with that title. It’s expensive but I could probably loan a copy for £3 from the library or so.

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• Understanding mongod log entries

  - by Jo Erlang

  Can anyone explain the numbers in the % column, in this mongod log snippet ? It is building a new index but I'm not sure I understand why the numbers look like that Tue Nov 20 11:38:08 [initandlisten] connection accepted from 127.0.0.1:49299 #8 (2 connections now open) Tue Nov 20 11:38:08 [conn8] build index xx.yyyy { source: 1 } Tue Nov 20 11:38:19 [conn8] 2921300/243339 1200% Tue Nov 20 11:38:29 [conn8] 4109600/243339 1688% Tue Nov 20 11:38:39 [conn8] 4400100/243339 1808% Tue Nov 20 11:38:49 [conn8] 4676600/243339 1921% Tue Nov 20 11:38:59 [conn8] 4939700/243339 2029% Tue Nov 20 11:39:09 [conn8] 5217800/243339 2144% Tue Nov 20 11:39:19 [conn8] 5439300/243339 2235% Tue Nov 20 11:39:29 [conn8] 5659700/243339 2325% Thanks

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• (svn+ssh) getting bash to load my PATH over SSH

  - by Eli Bendersky

  This problem comes up with me trying to make svnserve (Subversion server) available on a server through SSH. I compiled SVN and installed it in $HOME/bin. Local access to it (not through SSH) works fine. Connections to svn+ssh fail due to: bash: svnserve: command not found Debugging this, I've found that: ssh user@server "which svnserve" says: which: no svnserve in (/usr/bin:/bin) This is strange, because I've updated the path to $HOME/bin in my .bashrc, and also added it in ~/.ssh/environment. However, it seems like the SSH doesn't read it. Although when I run: ssh user@server "echo $PATH" It does print my updated path! What's going on here? How can I make SSH find my svnserve? Thanks in advance

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• Installing raid controller forces reinstall of Windows Server 2008

  - by Tyler

  So, I've tried two different RAID controllers that have external SATA connections on my Server 2008 machine. I can install the hardware, boot into Windows, install the drivers and reboot again. No problems. However, as soon as I try to use eSATA-connected drives and reboot something happens to the Windows install and I can no longer boot into Windows. I tried repairing from the command line, and the end result is that repair console tells me I have 0 Windows installations (?). I end up having no choice but to reinstall Windows to get back on track. I must be doing something fundamentally wrong here, but I don't know what :(

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• iptables: How to read this OPT string?

  - by alex

  I have a simple INPUT rule for iptables that logs any new connections to a logfile. --log-tcp-options and --log-ip-options flags are both set and I get the appropriate OPT output. One line of my log looks something like this: Nov 29 17:00:00 IN=venet0 OUT= MAC= SRC=x.x.x.x DST=x.x.x.x LEN=64 TOS=0x00 PREC=0x00 TTL=53 ID=37898 DF PROTO=TCP SPT=57755 DPT=8888 WINDOW=65535 RES=0x00 SYN URGP=0 OPT (0204057D010303010101080A3E521D4D0000000004020000) I would like to understand how to interpret the OPT string (bold). Is there some documentation available on what it actually means? How could I make it human-readable?

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• Ubuntu server failing daily

  - by deanvz

  Symptoms: Server becomes unresponsive - Increase in load, all services stop Loss of connectivity - Ping/SSH Flush MySQL hosts after reboot - As MySQL refuses new connections Intermittent Apache crashes Generally happens early morning hours - 2 days of the week are however excluded Changes made: Updated the OS - to Ubuntu 10.04.4 LTS Not sure if the MySQL server was also updated in the process Current MySQL version - mysql Ver 14.14 Distrib 5.1.63, for debian-linux-gnu (x86_64) using readline 6.1 Updated Plesk from 10.4.4 Update #47 to 11.0.9 Update #23 Rebooted on almost daily basis All crons stopped for the times corresponding to the server crashes Created a MySQL log to monitor the lock times on queries Possible causes: Failing hardware Incorrect software configuration (MySQL, Apache etc) Responsibilities: Small webserver Runs our billing system - WHMCS Responsible for CRONs Bulk-email solution - No delivery times coincide with server crashes Proposed solutions: Move machine over to VM Format and restore the Plesk server backup and take it from there? Side notes: Seems to be a general Apache failure across all our linux servers - Intermittent problem Are we doing something fundamentally wrong in the Apache config? (I understand that this is a secondary question, just making sure that it isnt possibly holding any relevance)

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• Increasing FreeBSD threads

  - by sh-beta

  For network apps that create one thread per connection (like Pound), threadcount can become a bottleneck on the number of concurrent connections you can server. I'm running FreeBSD 8 x64: $ sysctl kern.maxproc kern.maxproc: 6164 $ sysctl kern.threads.max_threads_per_proc kern.threads.max_threads_per_proc: 1500 $ limits Resource limits (current): cputime infinity secs filesize infinity kB datasize 33554432 kB stacksize 524288 kB coredumpsize infinity kB memoryuse infinity kB memorylocked infinity kB maxprocesses 5547 openfiles 200000 sbsize infinity bytes vmemoryuse infinity kB pseudo-terminals infinity swapuse infinity kB I want to increase kern.threads.max_threads_per_proc to 4096. Assuming each thread starts with a stack size of 512k, what else do I need to change to ensure that I don't hose my machine?

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• Need a Company to Fix My Plesk & IIS on windows 2008 [SOLVED]

  - by DevCompany

  Hello: I need to know a name of a company to fix my server install and get my sites running again. Windows 2008 IIS 7 Plesk 9.x The problem started when Level 2 of my hosting company adjusted a FTP users to have certain permissions....apparently he did this outside of plesk and it has been nothing but permission headaches all around. Connections....uploading files, etc. now somethings gone wrong where plesk isnt even loading properly and IIS too... I need to see if someone can fix this remotely before I give the green light to format and reinstall server, IIS, Plesk and Domains! looking to pay a company to get this working ASAP - This is not requested as a free job so I need someone good and who can fix it without the huge hassle of formatting and such. Need to resolve today Post expires on Monday 04-26-20010

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• Virtualmin Configuration

  - by Allen

  I am trying to get Virtualmin setup and have reached a point where my noobish sysadmin skills aren't getting the job done. This is the message I get now when I try and refresh the configuration of Virtualmin. BIND DNS server is installed, and the system is configured to use it. However, the default master DNS server XXXXXX is not a fully qualified domain name. Sendmail is only accepting SMTP connections on the following ports : 127.0.0.1 port smtp. Email from other systems on the Internet will not be accepted. This can be changed in the Sendmail Mail Server module. Please advise what I need to do to get Sendmail configured properly. Thanks!

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• Enable: Asp.net connection pool monitoring with performance monitor

  - by BlackHawkDesign

  If this question is at the wrong forum, be free to tell me. I'm a c# developer, but I'm running in a system management issue here. Intro: Im suspecting that an asp.net application is having some issues with the connection pool and that the pool is flooding from time to time. So to make sure, I want to monitor the connection pool. After some searching I found this article : http://blog.idera.com/sql-server/performance-and-monitoring/ensure-proper-sql-server-connection-pooling-2/ Basicly it explains stuff about connection pools and how you can monitor the application pool with performance monitor. The problem: So I logged in to the asp.net server(The sql database is hosted on a different server) which hosts the website. Started performance monitor. But when I want to select 'Current # pooled and nonpooled connections', I have no instance to select. There fore I can't add it. Question How can I create/supply an instance so I can monitor the connection pool? Thanks in advance BHD

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• VPN Network intermittantly fails to provide internet: What could be possible causes

  - by Jake M

  We have a small office with our own VPN setup. We occasionally experience failures in our internet connection where we cannot access the internet. Most of the time the internet connection will resume by itself(without me doing anything) after a period of time(10 mins). Would you be able to suggest possible causes of the connection failure so I can then go and run some tests? Our network architecture is like so: A 'Billion' brand router that is connected to the internet via phone cable and then connected to our Cisco Switch A Cisco Switch/Bus which is connected to all our office nodes, our external harddrive and also to our router as stated above. All connections are via ethernet cable A series of work computers(nodes) connected via ethernet cable to the Cisco switch. Our ISP is TPG Australia We have a Virtual Private Network All the ethernet cables are about 3 years old Do you think that the causes of our intermittant connection problems could be due to the following: Data collisions in the ethernet cables Old/Faulty ethernet cables Our ISP has bad service Can you think of any other causes of the problem?

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• How to disable Tcp/Ip settings in windows 7 via GPO?

  - by Akash Kava

  I have enabled following policies, "Prohibit TCP/IP advanced connection" "Prohibit access to properties of components of a LAN connection" "Enable Windows 2000 Network Connections setings for Administrators" after doing all these, all machines running windows xp, 2000 and vista have network settings properties button disabled as expected. However all machines running windows 7 have no effect, I believe there are few more steps, all Windows 7 machines are on domain and we want to control this via Domain Controler's GPO. Please let me know, what I need to do to have Windows 7 disable the properties of network connection, I am not network expert, I read few articles about what new has been added in GPO of windows 7 but I am blank. Everything works fine on Windows XP, Vista, 2003 Server. Only Windows 7 is a problem.

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• MikroTik ipv6 Tunnel

  - by MikeSmitty

  I've got a MikroTik router set up with the latest stable OS on it, and I just set up an ipv6 tunnel with Hurricane Electric, but I'm having an odd issue with it. I can't ping anything until I first ping the tunnel endpoint on HE's side. After that I can ping any ipv6 address fine, but give it a little time (say, maybe 30 sec) and I can't ping any ipv6 addresses again. Whenever it stops allowing ping to go through I notice the counter on my firewall rule that drops invalid connections goes up. this is my ipv6 firewall config: add action=accept chain=input comment="" connection-state=established \ disabled=no in-interface=sit1 add action=accept chain=input comment="" connection-state=related disabled=no \ in-interface=sit1 add action=accept chain=input comment="" disabled=no in-interface=bridge \ src-address=ipv6_address_here/64 add action=drop chain=input comment="" connection-state=invalid disabled=no \ in-interface=sit1 add action=drop chain=input comment="" disabled=no in-interface=sit1 Any ideas on what it could be?

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• Straight cable or cross over cable?

  - by om sai

  I have pppoe internet connection. My ISP provides connections like this: ISP->media converter(fiber)->8 port switch(TP Link TL-SF1008D)->to individual internet connection account holders (like me) Now the connection between the media converter and the switch is done using 4 pair cross over cat5 cable and I would like to connect the cable running from the switch to the router and through router to my PC. So what type of cable should I use to make the connection between the switch and the router (straight thru cable or cross over cable)? The point I am trying to make is I am able to connect to the internet using straight through cable between the switch and my PC but when I connect the same cable between the switch and the router and from router to my PC I am not able to connect to the internet. Also, if I am using the 2 pair cable (instead of 4) between the switch and the router I am able to connect to the internet but same is not true in case of 4 pair cat5 cable.

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• Windows 7 recognises the wrong router.

  - by Henry

  I have a cable router connected to my cable ISP. On the LANs are 4 computers, one of which is a dual boot XP/Win7 machine. I was given an ADSL wireless router which I connected to one of the LAN sockets on my cable router. I don't have an ADSL connection. All the machines connect correctly, some wirelessly, when my dual boot machine is in XP or off. However, when I go into Win 7 on that machine it finds the ADSL router and wants to connect through that (there's no ADSL connection) instead of my cable router and modem. I've turned DHCP off on the ADSL modem and even tried bridging its connections but neither of these have any effect. To get 7 connected, I have to either disconnect the ADSL router, or switch it off. Remember, the SAME computer on the same LAN works perfectly with the same router connected in XP! How then, can I get Win 7 to recognise the correct router?

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• TeamViewer cannot connect

  - by Cetin Sert

  Last week I decided to use TeamViewer VPN to administer software on a server behind a firewall using RemoteDesktop. It was easy to configure to start-up with the system and make VPN available on the other side but now it fails to connect at the step shown below: The remote machine is running Windows Server 2008 R2. Is there a native way to circumvent the external firewall using a server role or feature to make Windows Server do the VPN work? Do people have better / more reliable experiences with other products such as Hamachi? The requirements are as follows: Start at remote system start-up time Make VPN connections to the remote machine possible

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• Add power over Ethernet without new switches?

  - by dannymcc

  I need to power 16 IP phones over their Ethernet connections. I am in the process of changing our switches and only the phones need PoE, everything else is powered by mains cables. I have contacted the supplier of the phones and for 16 mains leads it will be close to £300. I know it's possible to get a PoE injector that goes between the mains and the phone but I would like to do this as tidily as possible and ideally in bulk. I imagine something that looks like a switch but doesn't actually 'switch' if that makes sense. Basically I want to inject power to 16 devices at once.

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• Windows 2012 Server Hyper-V: Cannot see LAN

  - by Samuel

  I have one NIC on the machine loaded XP on the Hyper-V and had chosen the network as virtual switch. No LAN and no internet shows up on the client. Am I missing something? it used to work in 2008-R2. Details: One network card on machine (Qualcomm Atheros AR8131 PIC-E Gigabit Ethernet controller) The virtual machine hard disk is pointing to and existing XP-SP2 hard disk created using VPC 2007 The Virtual machine Network Adapter is setup as Virtual Switch to the real ethernet controller with Enable virtual LAN identification set to 2 (no other virtual machine is created in the system) After the virtual machine boots LAN shows empty in Control Panel Network Connections (this is XP client) and I also cannot access the internet. XP is showing activation prompt but as far as I know it should not disable the network! Virtual network switch is set to External

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• SSL Proxy: Forwarding without the encryption

  - by John

  I have a python application listening on port 9001 for HTTP traffic. I'm trying to configure Apache (or anything, really) to listen on port 443 for HTTPS connections, and then forward the connection, sans encryption, to port 9001 on the same machine. My application would then reply via the proxy, where the encryption would be reapplied, and returned to the client transparently. I'm not doing anything crazy with the site names and SSL certs, I have one public IP, one hostname, and one SSL cert. Stripping the encryption at the proxy doesn't seem to be a common requirement. Is what I'm asking for a normal requirement? Are there other concerns with this sort of configuration?

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• ssh-agent key timeout with screen or tmux on bastion host

  - by Jericon

  Normally I have ssh-agent running, I ssh to my bastion host then open a tmux session and connect to other boxes through that. Key forwarding works for any sessions that I open from that point forward. If I resume my tmux session after closing terminal, sleeping my laptop, whatever, my key forwarding on my bastion sessions still work, as does forwarding on any new sessions. Existing ones don't work, though. I have a little thing in my bashrc that keeps key forwarding working when I resume tmux, but I am having trouble figuring out how to get it to keep working for sessions open within tmux. For example, I have bastion01, dbhost01, dbhost02, webhost01, and webhost02. If I open a connection to bastion01, start tmux there, and then connect to dbhost01 and webhost01 forwarding works. If I close that connection, reconnect and attach my existing tmux session, then add connections to dbhost02 and webhost02, key forwarding works on the 02 boxes, but does not on the 01. Please help!

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• Windows / Apache / PHP CPU at 100% under small load

  - by Bart

  I have a Windows box loaded with Apache 2.2 and PHP 5.2. It runs great if only a few users are on it at a time, but under load testing (50 users for test #1), the CPU climbs up to 100%. Nearly all of this CPU usage comes from httpd.exe. I currently have PHP set up via php5_module, but one of the first things I plan to try next is to use FastCGI instead. Is FastCGI better at handling multiple connections? Any other ideas on what might be causing Apache to run so high?

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• Internet Connection Sharing on OSX causes delayed web requests

  - by Vanthel

  I have an iMac connected to my router via WiFi, and a PC connected by ethernet to the iMac. The iMac is sharing its connection. I've never had a problem with this in the past (pre Lion anyway) but now all web page requests take an eon to resolve on the iMac (they are instant on the PC). It suggests to me the iMac is attempting to resolve it through the PC first every time? I've tried reordering the connections in the network settings but that made no difference.

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• Load balance incoming traffic

  - by justin

  Dear All Please I have the following scenario. 3 servers voip / mail / terminal one load balancing router 2 internet connections (static ip`s) My concern is to load balance incoming traffic since the outgoing traffic is being taking care by the load balancing router. For instance all offices connect to the mail server via the internet same for voip and terminal services. The mail and voip clients are set up with one of the static ip`s and the router forwards the request to the appropriate server. But obviously like this there is no fail over nor load balancing cause all requests are being directed to one internet connection. Anyone has a suggestion was thing of a dns server, does this make sens ? or maybe a hosted option ? Thanks Justin

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• Connmand Equivalent

  - by CurtisS

  What's the connmand equivalent on Fedora 15? I'm trying to connect to the Internet with Fedora 15 but I'm having problems. It can't see my network connection and when I try to run nm-connection-editor I get: (nm-connection-editor:9816): WARNING: **get_all_cb: couldn't retrivew system settings properties ... (nm-connection-editor: 9816): WARNING **: fetch_connections_done: error fetching connections: (32) ... (nm-connection-editor: 9816): GVFS-RemoteVolumneMonitor-WARNING ** cannot connect to the session bus: (nm-connection-editor: 9816) GVFS-RemoteVolumeMonitor-WARNING **: cannot connect to the session bus ... g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOSStream returned 0 bytes onan async read (g-io-error-quark, 0). Exiting.

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