Fedora :: X Crashes - Ssh To A Remote Centos Server Using X11 Forwarding
Nov 24, 2009
My X crashes when I...
1) ssh to a remote centos server using X11 forwarding
2) open the virt-manager remote application (the virtualization management app)
3) Open the remote console
Just to be clear, my local X11 crashes. I get back to the log in screen.
I get in my Xorg log:
Backtrace:
Fatal server error:
-Is this enough for a bug report?
-How I can make X dump a core file for better debugging?
-Do -debug RPM packages still exist, and if so, should I install one for the X server and will this help with debugging, and if so, how do I install it.
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Mar 31, 2011
I'm trying to implement remote NFS in our network
So I read a lot of posts on the Internet, but I don't understand which ports I have
to open/forward for this.
On some posts I see a lot of ports, I don't want to do this.
If this is the case, and I would set up NFS through an ssh tunnel, then do I only need the ssh port and does this mean it will always work if the server is reachable through ssh?
Or is this wishful thinking ?
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Feb 10, 2009
I've recently installed OpenVPN on my dedicated server (Fedora) in order to have full internet access for all of my WinXP clients. In case somebody is interested in the details of the OpenVPN installation, I followed this documentation: Rootserver-as-OpenVPN-Gateway. The installation runs quire nicely, I'm able to surf the net and even file-sharing programs work on the XP clients - at least to some extent. There is a slight problem though: the file-sharing programs complain that they have a "NAT problem" or that they are "Firewalled".
Most likely, this problem can be addressed by configuring remote port forwarding (RPF) on the server. The only routing rules which I've added on the server during the OpenVPN installation are these:
Code:
# initialize natting for openvpn
iptables -t nat -F POSTROUTING
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth0 -s 10.66.66.0/24 -j MASQUERADE
Let's assume a certain application on a client is listening on e.g. port 1234. How do I configure RPF for this port on the server side.
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Jan 18, 2010
I am setting up a new server with 2 nics installed. Nic0 goes to the firewall and nic1 goes to the internal engineering network.
Problem is Ip forwarding is not working!
Particulars:
Server Name - slick
Firewall Name - gateone
engineering node - crooked
Routing on slick:
From crooked ( which is inside the server (slick) with an ip address of xx.xx.221.249 the only way I can ping or anything outside of the firewall ( gateone) is to turn on IPtables with this configuration:
I don't want to use IPtables. I need the ip forwarding to work.
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May 25, 2010
I was able to do on Debian and Ubuntu Servers X applications running on remote servers where I was able to login via SSH. Tried the same with CentOS did not worked. in /etc/ssh/sshd_config
[Code]....
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Oct 20, 2009
as non root user gdb system-config-network
(gdb) run
Starting program: /usr/bin/system-config-network
Executing new program: /usr/bin/consolehelper-gtk
Detaching after fork from child process 8630.
[Thread debugging using libthread_db enabled]
Program received signal SIGSEGV, Segmentation fault. 0x00000033b5e5fac9 in ?? () from /usr/lib64/libgdk-x11-2.0.so.0 Missing separate debuginfos, use: debuginfo-install usermode-gtk-1.100-2.x86_64
[Code]...
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Aug 11, 2011
i am forwarding HTTP request to a internal server, it is quiet successful but access logs donot show the ip of the external m/c. Rather it shows the ip of the machine on which i have enabled port forwarding.
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Aug 8, 2011
I have two Centos 5 servers one running Asterisk with PHP installed and another sever running as a MySql Database server, at the moment when I try run simple script to see if I can connect to the remote server I get the following error.Quote:Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
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Sep 11, 2009
My server keeps freezing up requiring a hard reboot.
CentOS release 5.3 (Final)
httpd-2.2.3-22.el5.centos.2
Here is the error in /var/log/message
Sep 11 00:16:20 localhost kernel: httpd invoked oom-killer: gfp_mask=0x201d2, order=0, oomkilladj=0
Sep 11 00:19:14 localhost kernel: [<c0459e7d>] out_of_memory+0x72/0x1a5
Sep 11 00:19:14 localhost kernel: [<c045b352>] __alloc_pages+0x216/0x297
Sep 11 00:19:14 localhost kernel: [<c045c5bf>] __do_page_cache_readahead+0xc4/0x1c6
Sep 11 00:19:14 localhost kernel: [<c0436d9a>] ktime_get_ts+0x16/0x44
[Code]...
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May 13, 2010
I'm trying to SSH into my home computer from a remote location outside of my house's LAN and can't figure out remote port fowarding.
The guide here says to use the following:
Code:
I've tried connecting to my home computer through many combinations of the syntax listed above, read the man file, and looked online for help. But can't find out the proper syntax or a good guide that isn't written for Windows users using Putty.
Let's assume for the sake of simplicity that the public IP address of my home SSH server is 123.123.123.123, the private IP address of my home SSH server is 192.168.1.100, my home SSH port is 2222, and the SSH port at my current location is is 22. How would I write out the command?
Every time I try to connect I get a "connection times out" error.
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Jun 14, 2009
Ive been searching half the internet for a solution for a strange problem im having with a server (CentOS 5.2 Final). For no apparent reason, the server will just be powered off.I've looked in the dmesg log and /var/log/messages file, but that doesnt show anything, except the "syslogd 1.4.1: restart." message after booting it up again, and hours in advance of the crash a "suhosin" alert message.
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Jul 29, 2010
I'm currently in the last steps of migrating a CentOS mailserver to the x64 version.However, under the old 32 bit version, I was using XRDP to access the Centos box from my Windows boxes.However I can't seem to find the XRDP package in the standard repos so this is prompting me to look at possible alternatives (XRDP was incompatible with my windows 7 box anyway soI had to RDP to another server of ours running 2003 to RDP into the mailserver which was far from ideal).Basically, I'd like to be able to seamlessly access the Centos box with a standard RDP client.
I know VNC Server/Clients would be an option but RDP gives me the freedom of any windows box being able to access the server on the same adress/port without installing software on any windows box I encounter.Are there any viable alternatives to XRDP ?There's no "add-on" to VNC server that could enable it to accept RDP connections ?
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May 4, 2009
I have just installed CentOS 5. I have set mysql database to access from remote machines. But now the problem is it is not connecting from the local machine now.
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Sep 5, 2010
I am using debian testing on my office pc, but i need to access it's desktop from time to time. So i need No machine/teamviewer software that can provide me with possibility to interact my desktop. The problem is, that i want to run shadowed session type, because teamviewer is not good for me. So, when i run no machine in shadowed mode, it crashes with message "The connection with remote server was shut down, please check your network settings and try again." The log is here:
[Code]....
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Oct 25, 2010
Im using CentOs on a remote server. I've recently installed phpmyadmin but cant access from [URL] I checked the files and found only 3 folders in /var/lib/phpmyadmin -config / save / upload - all of them empty. Whenever I try intstall phpmyadmin again it just says its already installed and up to day.
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Jun 15, 2010
How to setup my server to use it remotely from my Home from a WindowsXP PC.I want to access my CentOS server. Please help me installing GUI or Remote desktop on my server.I have installed FREENX client on my WIndows XP PC now what next to do. what configuration do i need to do.If you have any link to tutorial please let me know.
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Dec 7, 2009
If I forward port 5764 to port 80 to my VOIP device, I can nmap and get a proper connection. If I forward port 5764 to port 22 to my server, it comes up filtered. It even happens if I try forwarding port 80 to my server. So I'm sure it has something to do with my server, but I'm not sure.Here's my Linksys iptables:
Code:
:wanin - [0:0]
-A FORWARD -i vlan1 -j wanin
[code]....
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Jul 28, 2011
I have a lot of problems with the server and I want to reinstall the Centos in order to have a clean system. The problem is that I have access only via ssh console (with putty aplication)
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Jun 9, 2009
I have minor problem. I am used to windows and netware environments. New to CentOS.
How do I remotely access the server for administration with a Graphical interface similar to Remote desktop in windows..
"Start-> Run -> MSTSC"
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Sep 14, 2011
I have installed CENTOS 5.0 .. IM new to this centos linux..
-->regarding the remote connection
how can i connect the server through remote from windows 7 ..graphical interface ?
how to install lamp or apache , php , mysql
can u guys provide me any link or book for as a beginner for centos ?.
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Feb 7, 2010
I am setting up Apache (Fedora 12) inside my home network. From inside my home network I access it without any problem. I need to set it up to access it from internet. I have the following questions. Here is temporary setup for testing purpose.
Internet-->ADSL modem (SEIMENS Speed Stream 4200)---> Apache (Fedora 12)
1. Do I have to do any kind of ports forwarding on ADSL modem. (There is no option to do port forwarding on Modem) May be I need different Model of Modem??
2. I tired to Ping my real IP for modem form another computer from internet. I am even unable to PING the ADSL 's real IP. Why it is that?
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Mar 17, 2009
I'm an OS X user that's just acquired a CentOS 5.2 server. The server contains a basic installation of CentOS 5.2 with OpenSSH already installed, which I use to connect to the server using OS X terminal. I have no physical access to the machine and if I somehow cripple OpenSSH I will need to pay a technician to fix the problem for me. So I'd like to get the instructions straight before I go in and mess around with the system.
I want to install a package that will allow me to add additional users so that they can upload files but not mess around with the system configuration. From searching on google rssh seems to be a viable path. So I'd like to go with that unless there's a better option.
I came across these tutorials: SFTP Setup for CentOS 4.5-5.x and How to: Restrict Users to SFTP and Block SSH Shell Access with rssh. But I haven't followed the instructions in either yet. I'm unsure if I'll be able to execute all of the steps remotely without compromising my root account's SSH access.
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Jul 14, 2009
Newbie on the block with Centos 5.3 on a test server and and Ubuntu on a test workstation Note the wiki on VNC for a windows workstation but presume I could do this more easily from "Jaunty" (Ubuntu v 9.04)
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Nov 4, 2009
I have a remote CentOS server (5.4 Final) to which I need to add remote access to a GUI front end. I have SSH access to this box (no physical access, I rent it and it is housed in a DC) and I think I have managed to install Gnome correctly:
[root@box ~]# yum grouplist
[snip]
Installed Groups:
[snip]
[Code]....
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Sep 28, 2010
I have a cent 5.5 server that I only have remote access to. I was wondering if there was a way to view potential updates before I issue the yum update command. I know that there is a notification in X that you can click on and will show you the updates before you actually perform the operation.
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Aug 31, 2009
Can anyone here point me to a walk-through or discussion of how to use Webmin to set up port forwarding/NAT on a dual-NIC Centos 5.3 box? The layout will be simple:
Internet --- NIC1 [CentOS Box] NIC2 --- Switch to other PCs
We have a BUNCH of exposed services that are on special ports -- for example, to connect to one machine, you go in with [IP_Address]:12000, and to connect to another, [IP_Address]:12002, etc., etc. We're currently using OpenSuse 10.3 on this box, and YaST makes this criminally easy (you give it the incoming port number and the destination IP/port numbers and it just works). But OpenSuse 10.3 is nearing EOL, we're buying a new machine, and I'd like to use CentOS on the new one.
I've read the sparse Webmin documentation in their Wiki, and it leads one to believe that you simply insert a "NAT" rule. But there's obviously something they're leaving out. I *am* opening the ports in the firewall. But when I log in to [IP_Address]:port, it just times out. The port forwarding never occurs. The test in this case is SSH, and I know that SSHD is working properly because I can log into that machine just fine from another PC on the same internal subnet.
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Feb 8, 2010
I have problem with connection to mssql 2000 from centos. i have installed php, freetds, unixOBDC on server Centos. My mssql server on another computer (windows xp). Now, when i tried to connect mssql with php : >> mssql_connect("192.168.179.100","sa","sa")
Centos return to me "Unable to connect to server: 192.168.179.100 in /var/www/html/work/test.php on line 15 "
note: mssql is running on windows, and user and password is same "sa".
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May 2, 2009
I need to install in my centos 5.3 a remote sesion login like a Terminal Server on Windows. I tried to use a VNC but I have a problem and it is that the user must be loged before on local machine. I need to can wake on lan my server and log in with that program.
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Jun 26, 2009
The word on all lips are "virtualization" so I decided to smell this flavor.
I have a machine running CentOS 5.3 64bit and I have unlimited access to this machine, but I don't want to reach it physically.
Is it possible to install and maintain a virtual medium using ssh or other remote connection?
When I installed the OS I have selected the packets regarding the virtualization, but now from where can I start?
Is somewhere a guide for doing this?
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Jul 13, 2009
I have built a Centos 5.3 server for a friend of mine that is being used as a NAS server. The server has 4 1TB drives in a RAID 5 configuration and a dedicated non raid system drive for the OS. My friend isnt very Linux literate so I need this bow to be relatively simple. I have worked most of it out but have a question with regards to remote reboot.
I need to be able to shut this device down through the power switch without human intervention (at the moment when the power switch is pushed the server asks to confirm shutdown) the server wont have a Monitor connected so this isn't practical. Is it possible to use the power switch to do an clean, immediate shutdown?
The other option is shutdown through a web page is this something that has been done before? I know he can do it through terminal by issuing a shutdown now command but as I said this guy wants something simple. I don't really want to explain everytime he needs to shut the Server down how to do it if he can just do it via a website or even with the power button.
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