All too often, my ssh session will freeze. I'm fairly certain the problem is at my end. None of the tilde commands work. In particular, ~# and ~. are nonfunctional. I can write to ssh's terminal window from another terminal window. If I kill the ssh process, I can ssh in again. The next time it happens, I will try another ssh session without killing the first one. dmesg did not show me anything interesting.
Any suggestions on how to diagnose?
On 10/26/2015 10:28 AM, Michael Hennebry wrote:
All too often, my ssh session will freeze. I'm fairly certain the problem is at my end. None of the tilde commands work. In particular, ~# and ~. are nonfunctional. I can write to ssh's terminal window from another terminal window. If I kill the ssh process, I can ssh in again. The next time it happens, I will try another ssh session without killing the first one. dmesg did not show me anything interesting.
Any suggestions on how to diagnose?
what OS/version are you ssh'ing from? what version of ssh is installed on this? [1]
what OS/version are you ssh'ing to? what version of sshd is installed on this? [2]
what network media is between these two hosts? anything out of the ordinary in the setup?
[1] rpm -q openssh-clients - assuming this is a recent centos [2] rpm -q openssh-server '' ''
On Mon, 26 Oct 2015, John R Pierce wrote:
On 10/26/2015 10:28 AM, Michael Hennebry wrote:
All too often, my ssh session will freeze. I'm fairly certain the problem is at my end. None of the tilde commands work. In particular, ~# and ~. are nonfunctional. I can write to ssh's terminal window from another terminal window. If I kill the ssh process, I can ssh in again. The next time it happens, I will try another ssh session without killing the first one. dmesg did not show me anything interesting.
Any suggestions on how to diagnose?
what OS/version are you ssh'ing from? what version of ssh is installed on this? [1]
openssh-clients-5.3p1-111.el6.x86_64
what OS/version are you ssh'ing to? what version of sshd is installed on this? [2]
rpm not installed uname -a Linux mail 2.6.24-28-generic #1 SMP Fri Feb 11 17:36:45 UTC 2011 i686 GNU/Linux mail.cs.ndsu.nodak.edu is not controlled by me.
what network media is between these two hosts? anything out of the ordinary in the setup?
Ethernet connection to CenturyLink router/DSL-modem. I hadn't thought to check for anything interesting on the router. I'll do that the next time it happens.
On 10/26/2015 01:28 PM, Michael Hennebry wrote:
All too often, my ssh session will freeze. I'm fairly certain the problem is at my end. None of the tilde commands work. In particular, ~# and ~. are nonfunctional. I can write to ssh's terminal window from another terminal window. If I kill the ssh process, I can ssh in again. The next time it happens, I will try another ssh session without killing the first one. dmesg did not show me anything interesting.
Any suggestions on how to diagnose?
I had this a lot until I added to /etc/ssh/ssh_config
ServerAliveInterval 15
Now I rarely get it.
On Mon, 26 Oct 2015, Robert Moskowitz wrote:
On 10/26/2015 01:28 PM, Michael Hennebry wrote:
All too often, my ssh session will freeze. I'm fairly certain the problem is at my end.
Any suggestions on how to diagnose?
I had this a lot until I added to /etc/ssh/ssh_config
ServerAliveInterval 15
Did it complain at all? Mine does not, it just freezes.
I can start another ssh session with the first one frozen.
On 10/26/2015 01:28 PM, Michael Hennebry wrote:
All too often, my ssh session will freeze. I'm fairly certain the problem is at my end.
Any suggestions on how to diagnose?
I can remember having this sort of issue a while back. I believe it turned out that our PIX firewall was being a bit too aggressive in pruning what it thought were idle sessions. Adding the following to my ~/.ssh/config file seems to have fixed it:
ServerAliveInterval 15 ServerAliveCountMax 3
The manpage for ssh_config describes these parameters and how they interact.
YMMV!
On 10/26/2015 04:33 PM, Michael Hennebry wrote:
On Mon, 26 Oct 2015, Robert Moskowitz wrote:
On 10/26/2015 01:28 PM, Michael Hennebry wrote:
All too often, my ssh session will freeze. I'm fairly certain the problem is at my end.
Any suggestions on how to diagnose?
I had this a lot until I added to /etc/ssh/ssh_config
ServerAliveInterval 15
Did it complain at all? Mine does not, it just freezes.
I can start another ssh session with the first one frozen.
It would freeze and eventually shutdown.
On Mon, 26 Oct 2015, Robert Moskowitz wrote:
On 10/26/2015 01:28 PM, Michael Hennebry wrote:
All too often, my ssh session will freeze. I'm fairly certain the problem is at my end. None of the tilde commands work. In particular, ~# and ~. are nonfunctional. I can write to ssh's terminal window from another terminal window. If I kill the ssh process, I can ssh in again. The next time it happens, I will try another ssh session without killing the first one. dmesg did not show me anything interesting.
Any suggestions on how to diagnose?
I had this a lot until I added to /etc/ssh/ssh_config
ServerAliveInterval 15
Now I rarely get it.
That seems to have done the trick for me.
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Jay Leafey -
John R Pierce -
Michael Hennebry -
Robert Moskowitz