Re: [CentOS] Gnome Terminal and xterm problems
I'd say the majority of the time this is a due to an unreliable internet connection or inconsistent equipment (routers, etc.) on the connection. My router at home is a piece of crap (aren't all consumer grade routers?) and if I leave an SSH connection open for several hours it will eventually hang. Devin On 7/15/07, Matt Shields [EMAIL PROTECTED] wrote: Interesting, we use OpenVPN heavily, but we also have a lot not behind the vpn. That will be something to test out, I haven't kept track of which servers it happens with. -matt On 7/15/07, Tim Meanor [EMAIL PROTECTED] wrote: I've seen a similar issue when I've had an ssh connection open to a remote site over a VPN connection (not a VPN client on my PC, but a VPN connection between my site and the remote site, between Cisco routers). Catting a large file would hang the connection, and I had to kill and re-establish the connection. The issue was that the maximum packet size over the VPN link was something like 1460. The VPN connection added 40 extra bytes of payload. When I would cat a large file, my computer would send 1500 byte packets with the do-not- fragment bit set. The routers couldn't pass the 1500 byte packet because it was too large, and the do-not-fragment bit prevented them from fragmenting the packet, so it would get dropped, and my connection would die. I don't remember the exact details, as it occurred a couple years ago, but the gist was that the MTU on the servers I had to connect to had to be reduced to something like 1460. I don't think this is exactly your situation, but it's just an idea of something to consider. -Tim On Jul 12, 2007, at 9:46 AM, Matt Shields wrote: I've noticed this in CentOS 4 5 and Fedora 5 6. If I'm in Gnome desktop and using any of the terminal programs and I ssh into any server, the connection just hangs. Not drops, it just hangs and doesn't recover. These servers are all over the country on different ISPs in Tier1 datacenters. Some are in our office, so they are on the local lan. We have a mix of RHEL 3, 4 5 and CentOS 4 5 on the servers. If I'm using a windows computer with putty or SecureCRT this never happens, it only happens when I'm using any of our linux desktops or laptops. It doesn't matter if I'm in the office or at home (on comcast) or over at a friend's house (verizon dsl). This problem has been going on for at least two years and I'm finally fed up to the point where I might switch back to windows since 99% of my job is working while ssh'ed into servers. Anyone had similar problems? -matt ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Gnome Terminal and xterm problems
Matt Shields wrote: It shouldn't be dns because the session is already established and it now IP based. I don't believe ssh tries to keep resolving the IP again and again. No session doesn't come back ever. It just hangs permanently. -matt We were seeing something similar to this a while back, SSH sessions to or from outside our network were dropping after some period of no activity (which may not be your problem). Eventually we found that the Cisco PIX on our perimeter was set to kill idle sessions sessions after a certain period. We were able to resolve this by editing /etc/ssh/sshd_config and setting the ClientAliveInterval to a non-zero value. In our case we set it to 240, which caused a ClientAlive request packet to be sent every 4 minutes over the encrypted channel as the idle threshold on the PIX was set to 5 minutes. This resolved our issues, perhaps it might help with yours. Just a thought! -- Jay Leafey - Memphis, TN [EMAIL PROTECTED] smime.p7s Description: S/MIME Cryptographic Signature ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Gnome Terminal and xterm problems
On Thu, Jul 12, 2007 at 09:46:00AM -0400, Matt Shields wrote: I've noticed this in CentOS 4 5 and Fedora 5 6. If I'm in Gnome desktop and using any of the terminal programs and I ssh into any server, the connection just hangs. Not drops, it just hangs and doesn't recover. ssh -vvv might give a glue selinux enforced on your client machines? Tru -- Tru Huynh (CentOS-3 i386/x86_64 Package Maintenance) http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xBEFA581B pgpv1ehSBWyXj.pgp Description: PGP signature ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Gnome Terminal and xterm problems
selinux is turned off on both servers and desktops On 7/12/07, Tru Huynh [EMAIL PROTECTED] wrote: On Thu, Jul 12, 2007 at 09:46:00AM -0400, Matt Shields wrote: I've noticed this in CentOS 4 5 and Fedora 5 6. If I'm in Gnome desktop and using any of the terminal programs and I ssh into any server, the connection just hangs. Not drops, it just hangs and doesn't recover. ssh -vvv might give a glue selinux enforced on your client machines? Tru -- Tru Huynh (CentOS-3 i386/x86_64 Package Maintenance) http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xBEFA581B ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Gnome Terminal and xterm problems
most problem in this case is DNS!! does the session comes ca. 30sec later? problem can be: 1) the server has wrong dns-server in /etc/resolv.conf 2) the client ip is a private ip, and not in /etc/hosts 3) the server ip is not in clients /etc/hosts point 2) is the problem i have most time bg, paul Am Thu, 12 Jul 2007 10:45:50 -0400 Matt Shields [EMAIL PROTECTED] schrieb: selinux is turned off on both servers and desktops On 7/12/07, Tru Huynh [EMAIL PROTECTED] wrote: On Thu, Jul 12, 2007 at 09:46:00AM -0400, Matt Shields wrote: I've noticed this in CentOS 4 5 and Fedora 5 6. If I'm in Gnome desktop and using any of the terminal programs and I ssh into any server, the connection just hangs. Not drops, it just hangs and doesn't recover. ssh -vvv might give a glue selinux enforced on your client machines? Tru -- Tru Huynh (CentOS-3 i386/x86_64 Package Maintenance) http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xBEFA581B ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Gnome Terminal and xterm problems
It shouldn't be dns because the session is already established and it now IP based. I don't believe ssh tries to keep resolving the IP again and again. No session doesn't come back ever. It just hangs permanently. -matt On 7/12/07, Paul Valentin [EMAIL PROTECTED] wrote: most problem in this case is DNS!! does the session comes ca. 30sec later? problem can be: 1) the server has wrong dns-server in /etc/resolv.conf 2) the client ip is a private ip, and not in /etc/hosts 3) the server ip is not in clients /etc/hosts point 2) is the problem i have most time bg, paul Am Thu, 12 Jul 2007 10:45:50 -0400 Matt Shields [EMAIL PROTECTED] schrieb: selinux is turned off on both servers and desktops On 7/12/07, Tru Huynh [EMAIL PROTECTED] wrote: On Thu, Jul 12, 2007 at 09:46:00AM -0400, Matt Shields wrote: I've noticed this in CentOS 4 5 and Fedora 5 6. If I'm in Gnome desktop and using any of the terminal programs and I ssh into any server, the connection just hangs. Not drops, it just hangs and doesn't recover. ssh -vvv might give a glue selinux enforced on your client machines? Tru -- Tru Huynh (CentOS-3 i386/x86_64 Package Maintenance) http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xBEFA581B ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
