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• Amazon EC2 Socket connection not being accepted

  - by Joseph

  I am trying to run a java application on my EC2 instance. The application accepts socket connections on port 54321. If I try and connect to it, it times out. My Security Group is set as: TCP Port (Service) Source Action 21 0.0.0.0/0 Delete 22 (SSH) 0.0.0.0/0 Delete 80 (HTTP) 0.0.0.0/0 Delete 20393 0.0.0.0/0 Delete 54321 0.0.0.0/0 Delete Is there anything else I need to do? # iptables -nvL Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination # iptables -nvL -t nat Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination #

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• Setting up virtual network in VMware workstation

  - by Saif Bechan

  I am playing around with VMware workstation and am trying to set up a small virtual network. I am having a little trouble with this I hope somebody can help me out. I want to have all the different virtual machines to have different internal IP adresses so I can ping them SSH etc, from within my windows machine. I am directly connected to the internet without a router, so using a bridged connection does not seem to work. The other options NAT and host-only do not seem to work also. I think i need to create a new adapter. I am testing this out with a virtual image of linux debain 5.0 lenny. I have WMware Workstation 7 with virtual network editor. Can anyone guide me in the right direction.

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• Can't unlock locked screen, in Ubuntu 12

  - by Camille Goudeseune

  After locking the screen (with a keystroke bound to xlock -nice 8 -mode blank), I can unlock the screen as expected, but only within a few minutes. After being locked overnight, when I hit a key (even Ctrl+Alt combos), the screen stays black with just a brief white flash across the middle of both monitors. The workaround is to ssh in from another host and restart X. Some months ago, this happened every few weeks. By now it happens almost every morning. How do I even start to diagnose this? What might I look for in log files? (The intermittency is particularly troubling.) Failing that, is there an alternative to xlock aka xlockmore? Hardware: 3-year-old HP minitower, GEForce 9800 GT, two Asus LCD monitors. Software: Ubuntu 12.04.2 LTS. Window manager awesome-wm. NVidia driver 304.88. XLock version xlockmore-5.31.

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• Running php and java in parallel on the same server

  - by manni

  I have got a java server from Rackspace. and I am already running a java application on the server. Now I want to run a php application on the same server. What should I do? When I asked Rackspace people, they said, apache is already installed on the server so I can run the php on it. I have also tried installing php on the server and then copied my php files in var/www/xxx but when I hit the url it is saying giving the page not found error. They have given me the ssh server root username and password. Thanks in advance.

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• Color highlights have vanished in emacs

  - by Jim Kiley

  I'm using emacs on a remote Linux server that I access via ssh. I'm editing C files that have a non-standard suffix, so I have had to manually enter c-mode with M-x c-mode every time I open one of those files. I found this to be annoying so I started monkeying with my .emacs to make that problem go away. This made all the color highlights in c-mode go away instead. Correction: All my color highlights are gone. I've removed the .emacs file, logged out and logged back in, but now, the color highlights are gone. I miss them! They were very helpful How do I get them back?

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• How to configure a static wildcard subdomain with dnsmasq.

  - by Prody

  I have a network behind a NAT with a few machines. The machines are: router - NAT, dnsmasq, forwarding - directly connected to the inet server - which runs ssh, www and some other stuff clients - which do stuff on server I also have mydomain.com. server.mydomain.com is pointing to my connection's IP (single IP), which is the router, which forwards ports to server. Server, has a httpd running, which serves different sites based on vhosts. So I have site1.server.mydomain.com, site2.. The problem is that all the traffic is going thru the router, and when I check logs I always see the router's IP for everything (so it's hard to see who is running the script with the while(1)). I would just ServerAlias site1.server.local, but most of the sites have a root URL saved somewhere on top of which other URLs are built, so I can't do that. The solution for me would be telling dnsmasq somehow to answer to *.mydomain.com with server's IP. Is this possible somehow?

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• Configuring MPI on 2 nodes

  - by Wysek

  I'm trying to create really simple "cluster" from 2 multicore computers using openmpi. My problem is that I can't find any tutorials on that matter. I don't want to use torque because it's not necessary in my case nevertheless all tutorials give configuration details either about torque or mpd (which doesn't exist in openmpi implementation). Could you give me some tips or links to appropriate manuals? Steps I've already completed: - openmpi installation - network configuration (computers see each other) - ssh password-less login to second computer I tried using machinefiles without further configuration and with just 2 IPs in it. But jobs don't seem to start at all after initialization part. (MPI seems to work because I'm able to scatter jobs on multiple cores of both computers without communication between them).

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• forward all ports via htaccess to new address

  - by user875933

  I have a chat server running on my local machine that listens to different ports. I want to use the sub-domain of one of my accounts to access it. I intend to manually change the redirect whenever my local machine gets a different ip address. So: chat.example.com:123 would redirect to dynamic.ip.address:123 I am trying to accomplish this with .htaccess and RewriteRule I have tried: RewriteEngine on RewriteRule ^(.*) http://dynamic.ip.address/ [L, R=302] but this doesn't work. When I try chat.example.com:123 nothing happens. When I input chat.example.com into the web browser, I get dynamic.ip.address Is .htaccess the right tool for this? I am using a simple web host that gives me ssh access, but not much more.

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• Ping IP: connect: no such process

  - by Matthew

  I am trying to figure out this issue and am getting a weird error. We have two boxes which used to talk to one another on the network. Both are reachable via ssh from a separate network, which means they are able to talk to their default gateways just fine. When we try to ping from the linux machine to the linux machine, we get a bunch of timeouts. When we try to ping from the linux box back, we are getting connect: no such process. I can't seem to find much documentation on this error, though there consistently seem to be references to VPN stuff when googling for this error. The

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• Web site kills hard disk I/O, how to prevent?

  - by Taras Voynarovsky

  The situation: I have a server, on which we have 2-3 projects. Starting not long ago, the server started hanging up (We could not connect to it by ssh, and the connected clients had to wait 20 minutes for top to give results) Early today I managed to execute gstat while it was in this state and saw, that it stays on 100% on da0, da0s1 and da0s1f. I dont quite know what those ids meen, but I understand that some processes just kill the HD by bombing it down with requests. I ask of some propositions. I dont know how to find the culpit and can't prevent this. I have freebsd on server.

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• How can I see if my server uses DDRII or DDRIII RAM?

  - by Temnovit

  I have a very newbie question. My server is running out of RAM and it is time to add some. The is located far away, and I need to buy some RAM and drive to install it. How can I determine, whether I need to buy DDRII or DDRIII, having only command line access via SSH? Is there some command that will print witch kind of RAM is supported by the server or I need to go and check the server physically? UPDATE Sorry, forgot to mention: I am using Ubuntu Server 9.04

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• Issues connecting to a pix 501 via console cable

  - by Bourne

  Have a pix 501 that was set up to do filtering and I was working on setting the vpn up when I lost ssh connectivity. Looking at the front, all 4 lan lights blink intensely green but in a very repetitive pattern. The funny thing is there are only 3 devices connected to the 4 ports so that's the first element that doesn't look right to me. Console cable light doesn't turn on when cable is plugged in and have tried rebooting it many many times to see the bootup sequence with no result. Also, I cannot connect to it via pdm or console but the traffic is permitted through. Are there any additional troubleshooting steps I could do or should I count it as dead? Thank you.

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• How to disable ^C from being echoed on Linux on Ctrl-C

  - by pts

  When I press Ctrl-C in any pseudoterminal (xterm, gnome-terminal, rxvt, text console and SSH) in Karmic Koala, the string ^C gets echoed to the terminal in Ubuntu Karmic Koala. This hasn't happened in Ubuntu Jaunty Jackalope. I'd like to get rid of the extra ^C. Example: $ cat foo foo ^C $ _ I got the above by typing C, A, T, Enter, F, O, O, Enter, Ctrl-C. I want to get rid of the ^C, and get this for the same keypresses: $ cat foo foo $ _ I tried setting stty -echoctl, which created a single-character HT (or a box with Unicode 0003 in it) instead of the ^C. I want to see absolutely nothing when I press Ctrl-C. I'm using Linux linux 2.6.31-20-generic-pae #57-Ubuntu SMP Mon Feb 8 10:23:59 UTC 2010 i686 GNU/Linux

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• How do I ask screen to behave like a standard bash shell?

  - by thornomad

  Just learned about the screen command on linux - it is genius. I love it. However, the actual terminal/prompt in screen looks and behaves differently than my standard bash prompt. That is, the colors aren't the same, tab completion doesn't seem to work, etc. Is there a way I can tell screen to behave just like a normal (at least, normal as in what I am used to) bash prompt ? Additional Information I am connecting via ssh from a Mac (Terminal) to a headless linux box (Ubuntu). After logging in, I have TERM=xterm-color and when I run screen I have TERM=screen. Am going to try the suggestions below to see if I can change the $TERM value first.

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• How to change the download save directory in ktorrent from a remote host

  - by Garethj94

  So I have ktorrent running on a server and I don't have the ability to see the X11 display for the client, and I need to change my download directory since I like to keep everything very organized. So I need a way to change the download directory for the program as a whole, not like decide where to put each and every torrent that I download. This can't be done through the webui preferences so I'm guessing that I'll have to do it through ssh somehow but from what I've read there really isn't a command to use. Also the way that I have the application run is on startup my server runs the command ktorrent, so it will already be running when I want to change the download location so I assume that I will have to restart the program as well. If anyone knows how to do this it would be much appreciated, and I can't think that I'm the only person to want this feature.

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• Cisco: changing VTP mode server/client to transparent

  - by J. Smith

  I have around 40 L2 switches (2960, 3560, 3500, 3750) running in VTP client mode and one L3 switch (6500) running in VTP server mode, all connected together. I would like to switch everything in VTP transparent mode without any interruption of service. I've already test on a poc version with 3 switches (Catalyst 2950, 3560 and 3750). Using serial and SSH connection, it is seems working but i'm not sure it is enough representative compare to the real network. Knowing that the VTP Pruning is enabled, I am wondering what would be the best procedure to proceed the changement. I've read that we could lost connection by keeping it enabled. Should I change the server or clients first? Is it important to change the VTP domain and VTP Pruning parameters?

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• How to restrict all services to single domain in Ubuntu?

  - by harold

  Someone has pointed an unknown domain to my server's IP address likely via A records. I would like to reject access to ALL services (httpd, ssh, mail, etc.) from this domain and only allow requests from my domain. I want to make it so when I connect to that domain it's completely rejected from my server. I can disallow access from HTTP by changing my web server settings, but I want to do this for every single type of connection. How can I do this?

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• blocking port 80 via iptables

  - by JoyIan Yee-Hernandez

  I'm having problems with iptables. I am trying to block port 80 from the outside, basically plan is we just need to Tunnel via SSH then we can get on the GUI etc. on a server I have this in my rule: Chain OUTPUT (policy ACCEPT 28145 packets, 14M bytes) pkts bytes target prot opt in out source destination 0 0 DROP tcp -- * eth1 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED And Chain INPUT (policy DROP 41 packets, 6041 bytes) 0 0 DROP tcp -- eth1 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED Any guys wanna share some insights?

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• centos 5.6, virtual on Vsphere

  - by Glasnhost

  suddenly my virtual centos server (5.6 on VMWare-VSphere) is not working... It started with the url not responding, nor the ip. (NO HTTP response, no ping). When I entered on the server via ssh to start troubleshooting I noticed that most of commands don't work anymore: top- machine hangs (it's not slow anyway) ps - machine hangs (funny enough apache server and web app are running and sending me emails) on some directory ls -l - machine hangs after first file, if ls l.txt the file show only the first file "more" command, also hangs on some file. So there are very little things I can try. I recovered my virtual machine from yesterday and before yesterday, and they show the same behaviour, it hangs on commands (but yesterday they were working). There is no firewall on the machine, there is on the host though. I can connect with ftp but I can't download files nor list directory apart the user top directory... Working hard right now, any idea appreciated

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• DHCP server inside a virtual machine can't see other machines

  - by William

  Hi, I setup a private network from virtual machines and one of the machines is the DHCP server for the group. I want to specify a next-server for the DHCP server but I'm having trouble connecting to any of the machines that I lease IPs to. I'm just trying to do a simple ping/ssh to 10.0.0.252 (a machine with a lease) but it doesn't seem to respond. Any advice? I'm assuming I need to be able to connect to my next-server but maybe I'm wrong. Thanks.

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• Can't get iptables firewall working correctly

  - by Jay

  I'm setting up a new Centos 5.6 system and can't get my iptables firewall to work correctly. it won't let me use SSH through it. I'm new to Centos but not to Linux or iptables. I've been removing things until I have isolated the problem. I set up the firewall with a default ACCEPT rule for the INPUT chain. I can connect through to the server fine. If I change the command to only allow traffic from the interface connecting to my trusted network it stops working. Working: iptables -A INPUT -s 0/0 -d 0/0 -j ACCEPT Failing: iptables -A INPUT -i eth0 -s 0/0 -d 0/0 -j ACCEPT I've double checked the ip address I'm using corresponds to eth0 using ifconfig. Any ideas where I went wrong?

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• freebsd dev server on virtualbox over windows

  - by g_kaya

  I need a unixy environment for development purposes. I hate doing things on windows but it is more stable for daily use and I don't have a mac, so I'm having to use windows (7). I want to run freebsd in a virtual machine, configure it to be the localhost server, be able to connect using ssh (within my home-network) and be able to install vbox guest addons. If guest additions aren't the best, I can use solaris or linux flavours. I need no gui. I don't know anything about network stuff, so I need a detailed explanation from vise people here, or a nice doc to read. Edit : To be more specific as requested, I use following on unices: *django 1.4 *apache *python (2.7) *emacs *mysql *probably node.js *bash scripting I use windows to be able to do daily things easily, like connecting to my tablet, browsing and learning java. And I don't want to use linux as my desktop os, beacuse it gets broken a lot, it's annoying to maintain wlan problems and some more.

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• Which TCP ports to use?

  - by rowatt

  Is there a TCP port range which I can be sure will not be used by anything else for traffic between two machines? If I am reading RFC6335 correctly, I can be sure that no other applications will use specific ports in the Dynamic/Private/Ephemeral range of 49152-65535. However, if I understand correctly, it also states (section 8.1.2) that an application shouldn't assume that any given port in that range is available at any given time, which would mean I can't be 100% sure that it will be unused all the time. Specifically, I want to assign specific SSH traffic to a different port for the security benefit and so I can classify it differently for QoS purposes, and not have to worry about changing the port in the future.

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• How to set/keep directory permissions?

  - by Dylan

  I'm using CwRsync to connect from my Windows development machine to a linux webserver : rsync -avuz -e ./ssh --exclude=".svn" /cygdrive/c/xampp/htdocs/project123/ [email protected]:/home/user123/public_html This syncs my development project directory nicely and fast to the server. But after doing this, all directory properties are reset to the local user user123 only, so the website is not available anymore. I need to manually reset those properties. Why is this happening, and how to prevent it? PS. coming from a Windows environment I'm having a really hard time understanding rsync. I copied the above command from some examples... just need to get this one small thing working too...

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• Use .htaccess to block *All* access to specific folders.

  - by Urda

  I am not sure how to do this, but I want to block all access to a specific set of folders on my web server. Say secret01 and secret 02... homeDir |- data |- www | |- .htaccess (file) | |- images | |- js | |- secret01 | |- secret02 | |... |... What rule(s) do I need to add to my root .htaccess file to do this? I want all access from the web blocked from going into these folders, period. Only way one could get to them would be over SFTP or SSH. So what rule am I looking for? I am preferably looking for a one-liner so I can add more folders or move it to another site down the road. I really would prefer if the rule could be placed in the .htaccess root file so I don't have to jump all over the place to lock and unlock folders.

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