Solved

Immortal SSH Session

Posted on 2014-09-12
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Last Modified: 2014-09-15
Happy Friday!!!

I've got a little TurnKey Linux Debian Squeeze VM that I use for SFTP.  I had a user login and transfer a file the other day and now I can't seem to kill the session.  

I'm still a little shaky in Linux but here are the symptoms:
"#netstat - tanp" shows the user with an established connection with a PID/Program name of 2603/sshd
"#kill -term 2603" runs successfully but...
"#netstate -tanp" shows the foreign address in "TIME_WAIT" with an additional entry of "ESTABLISHED" with the same foreign address

So it looks like something is restarting.  I confirmed with the user that he's not actually connected.  

Also tried restarting ssh and also rebooting the VM several times.  

Any idea what's happening or how I can kill this?  

TIA!
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Question by:ttist25
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gheist earned 500 total points
ID: 40319806
That is how TCP stack works. It will wait for other end to csend a packet and then it will close connection.
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by:ttist25
ID: 40321038
any way for me to close it manually?  It's driving me nuts!  :P
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by:gheist
ID: 40321049
There is no socket. Kernel keeps parameters to let other end close correctly.
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Author Closing Comment

by:ttist25
ID: 40323581
Thanks for the help Gheist.  It looks like there must be a timeout somewhere because the connection is gone as of booting the VM this morning.
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Expert Comment

by:gheist
ID: 40323649
Anywhere between minutes and days.
two parameters seen by
# sysctl net | grep _tw_
control this (but documentation is contradictory at best,so best is to configure less...
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