Re: [CentOS] Gnome Terminal and xterm problems

2007-07-16 Thread Devin Henderson

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
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Re: [CentOS] Gnome Terminal and xterm problems

2007-07-15 Thread Jay Leafey

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]


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Re: [CentOS] Gnome Terminal and xterm problems

2007-07-12 Thread Tru Huynh
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


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Re: [CentOS] Gnome Terminal and xterm problems

2007-07-12 Thread Matt Shields

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

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Re: [CentOS] Gnome Terminal and xterm problems

2007-07-12 Thread Paul Valentin
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
 
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Re: [CentOS] Gnome Terminal and xterm problems

2007-07-12 Thread Matt Shields

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
 
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  CentOS mailing list
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