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Hi I am getting a really annoying SSH Putty Connection Timeout Issue which I can not fix

Happens when its running a command which is taking a while - some of the commands I run can take 2 hours or more to complete When it disconnects I can not see if the command completed or not.

I have a dedicated server centos 6 , 16gb ram - Apache 2.4 and Nginx PHP 5.6 and PHP 7.1 using with MultiPHP Manager PHP-FM - I have tried to increase some settings via WHM but not making any difference - can someone let me know which settings I should be looking to increase or change to fix this problem

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    i think running the command in background mode will solve that, you can do that by adding the & symbol to the end of the command – Mheni Aug 9 at 18:42
  • Network Error Caused Connection Abort is what happens after it runs over 2 hours I will try the suggestion and update – jt9489 Aug 9 at 20:02
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Sounds as if changing the tcp_keepalive_time kernel keepalive setting may help.

Check the value (usually set to 7200 seconds) thus:

cat /proc/sys/net/ipv4/tcp_keepalive_time

and to increase the value do:

   echo 14400 > /proc/sys/net/ipv4/tcp_keepalive_time
  • This looks more like it as I did get 7200 when checking and it happens after 2 hours, I increased it as per your suggestion and will update thanks – jt9489 Aug 9 at 22:25
  • I have tried the suggestion in the Answer however I see that now still the putty is getting disconnected and becomes un-useable fails to complete the task in the command - but only now there is not error display popup coming as before – jt9489 Aug 10 at 22:16
  • You need a much, much lower number here, say 300. – Michael Hampton Aug 14 at 4:26
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i suggest using Linux screen sessions, they are made to solve this problem.

you basically

  • create a screen session and run your program
  • detach from the session if you don't need it, and even if you ssh connection breaks the screen session is still running
  • when you ssh back to the server you reattach to the screen session and find you results.

here is a link to a simple tutorial about screens.

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