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Each time putty is breaking session after some time if I am doing nothing.

There is no any time parameter on putty so how can I stay my putty ssh session always Alive ?

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There is no solution to this problem. Putty is buggy software and requires an internet connection that has 100.00% uptime and 0.00% packet loss. –  Eric Leschinski Oct 26 '14 at 17:52

3 Answers 3

up vote 8 down vote accepted

Another thing to check is if your system is setting the environment variable TMOUT. To check this you can just do:

env | grep TMOUT


echo $TMOUT

If it is set, you could change it or unset it. To change the value:

export TMOUT=3600

Where the number is the number of seconds until you get logged out. Otherwise unset it to turn off the feature:

unset TMOUT

Note, it may be that your system administrator has set this for security reasons. So if you are not the system administrator you may want to check this before changing anything yourself.

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Try enabling keep-alives. This causes PuTTY to send SSH null packets to the remote host periodically, so that the session doesn't time out.

There are other things that can cause connections to drop, but this is worth a try. If it doesn't work, you'd need to look into these other things: VPN timeouts, router timeouts, settings changes on the remote SSH server, flaky connections, etc.

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Alternatively run something that produces continuous output such as top when you are away. –  ultrasawblade Sep 6 '11 at 12:08
@ultrasawblade: That is a duct tape fix; it merely treats the symptom but does not address the true problem. –  Kevin M Sep 7 '11 at 3:47
Please also specify where the option is. –  Rahil Wazir Sep 24 '14 at 11:29

In addition to the other answers, I'd suggest running screen to be able to have session management even if putty does terminate (connection dying, vpn going down, etc.).

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