CentOS 5 Networking :: Can't Seem To Get The X Server To Allow Access From Clients On Other Hosts?
Jan 8, 2009
I can't seem to get the X server to allow access from clients on other hosts. (I know, not exactly a network problem, but. I made the change in /usr/share/gdm/defaults.conf to be : DisallowTCP=false
and this worked on another CentOS system, but it hasn't fixed it on this one. What other things could prevent other clients from connecting to the X server? From the local host, I get :
Warning: Tried to connect to session manager, Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed although the client DOES actually create the window and work! So, maybe this message is a clue.
From the remote host, I get : Error: Can't open display: 10.10.1.20:0.0 Which is not terribly informative. Is there a log somewhere which details why a connect request was denied? The files in /var/log/gdm are not very informative.
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Dec 27, 2010
what is the best way here? I have like 5 servers, and I want my clients to access each of them, so in case 1 server is down, they can access remaining servers. Also, it will work like user1 chooses the server number and is connecting to a central database, then reply is OK, and he can connect to the server number he wished.
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Jan 7, 2010
i have successfully setup PPTPD on my server and I can open a VPN tunnel but my clients can only ping the server's IP, they don't have access to the internet through the VPN.
i have searched different forums and understand that I have to create a route on the server to route packets between the VPN interface and my internet gateway, but I didn't manage to get this work.
here is what my setup looks like:
Code:
root@r31495:~# ifconfig
eth0 Link encap:Ethernet HWaddr 00:1c:c0:c7:13:35
inet addr:94.23.197.XX Bcast:94.23.197.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[Code]....
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Sep 21, 2010
I have openvpn tunnel setup between two CentOS servers. One of the CentOS servers also acts as a DHCP server for some client computers.
Server A= OpenVPN server
Server B= OpenVPN client (connects to Server A with OpenVPN)
The two CentOS servers can ping each other (172.16.0.0/24) via the tun0.
However, client computer connected to Server B (DHCP server) can't reach 172.16.0.1 (which is the OpenVPN server).
I think I am missing some routing in my "ip route show". Following is the full picture:
What command can I issue to get this fixed? something along ip route add?
There is no firewall service on both end. service iptables stop! I can't bridge eth1 and tun0 as DHCP server might mess up the other side. I can't do a push of "redirect-gateway def1" because then clients loose their IP as they send DHCP requests to Server A.
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Jan 3, 2011
I am stepping into Linux world ...and I have chosen CentOS.
I have installed CentOS 5.5 on a dedicated IBM server successfully. My server has two network cards. I have configured eth0 for lease line internet connection with a live IP (113.xxx.xxx.xxx) and eth1 for local LAN with a static IP (192.168.0.1).
Now,
1. DHCP is working fine and I can access the server from my Windows XP clients.
2. I can access the server with SSH client PuTTY from home ( with the live IP ) and from the local LAN (with static IP 192.168.0.1)
3. I can access my shared server directory 'public' from my XP clients
4. Internet is working on sever and I have updated the server with yum update.
But, I cannot access internet from my XP clients machines.
I read "The Definitive Guide to CentOS" and tweaked the config files in different ways but it did not help. now after two sleepless nights I am here as my last hope.
I admit, I am not aware of every linux terms and commands, but I am getting into it. code...
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May 19, 2011
I have been searching and reconfiguring for 6 days now and have lost several clumps of hair.. PROBLEM: I want 2+ virtual hosts on my ubuntu server (1 ip) BUT - Only the first "alphabetically" listed sites-enabled shows.
000-default
[URL]
Individually they all work (if i a2dissite for each leaving 1)
[Code]....
it seems i have tried everything that everyone else is having issues with but nothing seems to fix mine. Possibilities:
1) EC2
2) Permissions on the files - I changed everything to the apache2 user "www-data" - no dice.
3) I am a dope...lets hope its that and one of you kind people point me to my issue.
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Apr 11, 2011
I am running an application that requires use of my /etc/hosts file. In it, I have my machine name and its LAN ip address. The program creates a service on a specific port, then attempts to connect to it based on the host name. So my hosts file has to be correct.I added the nameservers to resolv.conf and now my application will not run. My guess is that the computer is checking the name servers first, timing out then checking the hosts file.Is there a way I can tell the system to check the hosts file first, then DNS. I thought it should behave that way by default, but it does not appear to.
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Dec 29, 2010
if I use Linux File server with NFS Configured, Can MAC clients (workstations) access the files on Linux server over the LAN network
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Jan 20, 2011
I'm curious but recently I was troubleshooting some iptables rules to allow nfs clients access to my nfs server. What was strange was that I setup a tcpdump session on my nfs server so that I can see which ports were being requested. I ran several tcpdump sessions with the following filters in place.
tcpdump -vv src ip_of_client and dst _ip_of_client
tcpdump -vv src hostname_of_client and dst hostname_of_client
However, the only packet I ever saw come over the wire to me was the client host asking for a arp resolution. Anyhow, I finally just ran 'rcpinfo -p' and added those ports to my iptables rules and it worked great. However, I would like to understand how nfs works in case I need to troubleshoot it in the future. I do understand that nfs uses portmappers, would this explain the behavior?
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Aug 26, 2010
I have a linux box (fedora) with two ethernet cards eth1 and eth2. On eth1 I successfully configured a PPPOE internet connection. Such that from the server I can browse the internet. On eth2 I wired it to a wireless router essentially to provide the wireless cloud. On eth2 I also configured dhcp, such that the Linux box is both PPPOE and DHCP server.However my clients on the LAN cannot access the Internet.
On passing the routing command I get
Destination Gateway Iface
196.44.x.y 0.0.0.0 ppp0
192.168.1.0 0.0.0.0 eth2 (my subnet)
0.0.0.0 0.0.0.0 ppp0.
The router (functioning as a wireless access point mainly) has a fixed IP address of 192.168.1.2 and eth2 has IP address 192.168.1.1. The dhcp file running on Linux has been set with option router (Gateway) 192.168.1.1. I cannot figure out how to correctly set the routing table such that my clients on wireless can access the internet cloud. I googled and googled but no solid solution. Any suggestions?
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Jan 11, 2011
Using CentOS 5.5, FreeRADIUS 2.1.7.
Objective is simply to be able to allow wireless clients access to my network based on their MAC address (I have about 10 WAPs around the country which I need to be able to manage user access centrally). Not interested in LDAP or dishing out keys/certificates etc.
I have been trying to follow the guide here. Sounds like it's exactly what I need but I'm not sure about a few things.
1) For each of the conf files am I supposed to be replacing everything currently existing in the respective file with what is suggested?
2) "raddb/modules/file" does not exist, so I assume I should use "raddb/modules/files"?
3) If I uncomment the line:
Code:
#rewrite_calling_station_id
under the "raddb/sites-available/default authorize{}" section, the radiusd startup gives me the following error:
/etc/raddb/sites-enabled/default[69]: Failed to find module "rewrite_calling_station_id".
If anyone familiar with FreeRADIUS 2 could answer these queries I might be on the right path
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Sep 9, 2011
I have tftp-server running on Centos 5. Clients which are on the same subnet as the server are able to get and put without problems. I have a client that is across the internet that is having trouble getting files from my tftp server. A tcpdump reveals that the client is requesting the same file over and over again. In /var/log/messages, I am see the following error repeated over and over until the client finally gives up.
localhost in.tftpd[12727]: tftpd: read: No route to host
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Feb 15, 2011
I want to give access to a student to a server in order to make repeated trials of traceroute to different hosts. We have realized that it is preferable to use the -T option, as it sends TCP packets that are less commonly blocked by firewalls. However, this option is only available to superusers, and I don't want to grant the student such privileges.
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Oct 19, 2010
At my work, we have several clients (outside clients) that have an FTP login to our FTP Server. Their login then leads them to their home FTP folder. The FTP server is currently a Win2003 box. Because we have so many clients, we would like to implement some form of WebGui that would allow each client to manage their own FTP home folder and user info, such as resetting their password if they lost it.
Is there anything like this available in linux that would provide us with that kind of control/usability?
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Apr 4, 2011
I have a server (called NAS) that shares out /public, and I also have this same server running KVM with some VM's. I am setting up the first VM now, and one of the things it does is download torrents onto the share. I am connecting it via "mount -t smbfs //nas/public /mnt/nas" from the VM on the host and it seems to work fine. However whenever I add a torrent to the queue on the VM to download, all downloads stop and seem to be disconnected. I can restart them after a few seconds, but they will stop after a few minutes with another disconnect error. I have the network interface bridged, so I thought it was talking directly to the host.
The appropriate lines in my smb.conf:
security = share
[public]
comment = Public Stuff
path = /public
[Code]....
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Nov 29, 2010
Actually i have to make one share folder on linux in such way that user should only read the documents from shared folder and they should not take prints of that folder.could any one telme what server i should use.?samba or nfs?how can i stop client users to stop taking prints from that shared folder.
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Jun 27, 2010
I am trying to find the proper way to setup a NFS4 Server with two clients. I have:
FileServer: CentOS 5.5
-IP:10.1.1.200
-User: Max
-Export: /FS-Data
[code]....
User/Group Max owns FS-Data on the FileServer, How do I go about mounting it on the clients, since root can only mount?
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Dec 9, 2009
We recently upgraded our NFS server from Centos 4.4 kernel 2.6.9-42.0.10.plus.c4 to Centos 5.4 kernel 2.6.18-164.6.1.el5
In our queue directory where we shuffle files to be processes some files will go missing.
Example structure
/Queues/Process1/subdir_xxx
/Queues/Process1/subdir_xxx
etc...
/Queues/Process2/subdir_xxx
/Queues/Process1/subdir_xxx
etc...
Where 'xxx' is a date/time string down to the second.
Each subdir entry contains a number of files, depending on load at the time.
What we see happening is that a subdir will appear empty from a client (ls -la shows . and .. ) but an rmdir will fail with a 'directory not empty' error. From all 7 clients (mix of Centos 4 and 5). However on the server the files are visible. If we 'touch' the files the clients will then pick them up and process them.
It doesn't appear that waiting any amount of time will make the files visible (we've waited 8 hours while testing).
We've tried different mount options, NFS4, etc. Nothing got rid of the issue. Changing one server to use CIFS however solved it. So it appears to be some bug in NFS.
The problem appears to be intermittent and random, we can go hours without seeing it, or minutes. I'd say it affects fare less then 1% of the files written.
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Mar 17, 2011
I am researching the CentOS Cluster Setup. Does anyone know of a guide on this or have a thread linked that I can look at? I want to build a small cluster and then be able to add to it as it grows. Mainly I want to have web hosts, data, and mail behind it. The DNS will probably be on there own.
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May 22, 2009
I have a fairly simple iSCSI setup using two devices, but they have swapped names on different machines. running CentOs 5.3 ia64, and using iscsi-initiator-utils-6.2.0.868-0.18.el5
vm1:
[root@vm1 ~]# fdisk -l
Disk /dev/xvda: 4194 MB, 4194304000 bytes
255 heads, 63 sectors/track, 509 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
[Code].....
Any way to get iSCSI to mount the devices as consistent device names ?
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Feb 22, 2011
I am trying to run two web servers (Virtual Hosts) on a single Linux Centos 5.5 box with a single IP address 192.168.0.182. I did all the pre-installation requirements such yum install mysql, yum install mysqladmin, service httpd start, service mysqld start etc etc.In /var/www/html directory, I have two folder called server1 and server2. These two folders have the necessary web server php script files and folders. I opened the browser and managed to install the script on one web server successfully. When I put the IP address 192.168.0.182 on the browser address bar, the page loads without any problem. Now I would like to be able to install the other web server script and I don't know how to?Here is my httpd configuration;
<VirtualHost *>
DocumentRoot /var/www/html/server1
ServerName development.mysite.com
[code]....
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Sep 17, 2010
I've completed the installation of a CentOS server.Running the setup utility as root, ive set up a static IP and installed apache. Now this works ok. I can type in the servers IP address from my browser/putty/winSCP and access the server within the intranet. The problem is that i would also like to access the server using its hostname, e.g. http://centos or whatever Currently i cannot do it. I've searched the forums, edited the /etc/sysconfig/network and /etc/hosts to no avail no matter what i do i cannot access it. i've disabled some services so im not sure if this is the fault.
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Mar 25, 2011
I got below Code from Someone so that I configure Squid using which I can block websites.
#!/bin/sh
# squid server IP
SQUID_SERVER="192.168.0.2"
# Interface connected to Internet
INTERNET="eth0"
[Code]....
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Oct 20, 2009
Don't work nslookup from clients guest OS.I have LinuxMint 7 and I'm installed VirtualBox on her. I created three guests OS. Two CentOS and XP
Name
The first CentOS linux1.starline.ca
The second CentOS centos.starline.ca
The third XP xp2.starline.ca[code].....
On the clients guest OS nslookup don't work. It write : timed out; no servers could be reached .What is going on? Why nslookup don't work from clients guest OS?On client machine in the file /etc/resolv.conf have record ameserver 168.135.88.2
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Jan 11, 2011
i have openldap server with phpldapadmin as a gui, i'm gonna use the ldap server just for address book.you can see in the picture how i built my ldap db.
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May 26, 2011
I have setup openldap and samba for authenticating Windows and Linux clients on my server. They are working fine. Windows users are getting authenticated through server as Primary Domain Controller and Linux clients directly from Openldap directory. But I have little problem that is I want to mount home folders created on server to be available on clients so clients get a centralized storage with some quota on both Linux and Windows clients. Can you help me please how can I do that.
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Jan 17, 2009
I've installed centos 5 on an old computer with success and it works great.I can access the web server hosted on the centos server from any computer on the wireless and wired local network. I can also use ssh (putty) and nx client from any computer on the local network (wired and wireless) to access the centos server.On the wireless router I've configured a port forwarding to the wireless network interface on the centos server. I can access the centos server from the outside (internet) through this port forwarding both through http and ssh or nx client.MY problem is that I can't access the centos server from the internet through the wired network interface. Any attempt to view a web page or login with ssh or the nx client will timeout.
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Feb 27, 2009
I recently installed CentOS 5 as my server. I have samba running 100%, today i was working on NFS i had it semi working at one point where i could mount to the shared folder but i could not see any of the files in it, now when ever i try to access it i get, mount.nfs: access denied by server while mounting 192.168.1.100:/Server
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Sep 1, 2010
I'm new to Centos 5 (and Linux) and, after installing Centos, I configured Samba, Apche, ... w/o problems (through interactive interface). My problem is tha t I need to use DHCP (all our clients use dynamic IP addresses for the ease) but I don't find dhcpd ... nor the sample config file(s).
Note : the new server I intend to use is actually connected on a LAN with an 'old' DHCP server (still under W2K server), is this the reason why I can't find/activate dhcp on my new machine ???
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Aug 17, 2011
Well, as many proxy applications, GNOME Network Proxy Preferences only allow to ignore hosts. What I want to do is exactly the opposite. I only want to use the proxy for few sites. Is it possible to define only the allowed hosts in any way?
PS: I know FoxyProxy add-on for Firefox does this, but 1)I don't use Firefox and 2)I want the proxy settings system wide not only for browser.
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