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I have launched an EC2 instance running ubuntu 16.4 and able to connect using Pytty SSH with Key pair. The issues is even when I'm executing some commands - that is actively working, the session closes every 20 seconds. If I restart the session, I can connect, closes after 20 seconds again. I tried to configure "Seconds between keepalives" to 10 or 20 or any other number, save the session, reopen the connection, I still have the same problem. I also tried to enable TCP_KeepAlives checked, but the problem persists.

I was able to work properly earlier, but I am having the above problem for the past 2 days.

  • Window pops up with "Server unexpectedly closed network connection" – Sridhara Tv Feb 8 at 17:18
  • No. I'm connecting only one session.The last message on the putty log is Event Log: Server unexpectedly closed network connection – Sridhara Tv Feb 8 at 17:41
  • I can reproduce the error you're getting if I manually kill the sshd process that spawns my session. I suspect your remote sshd process(es) are being killed by something. – Jeff Schaller Feb 8 at 17:58
  • A related, but different, question is unix.stackexchange.com/questions/412192 . – JdeBP Feb 8 at 18:56
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I had this issue on a AWS Linux AMI instance recently. Should apply to others as well. Changing the server side keep alives worked for me:

  • Edit /etc/ssh/sshd_config
  • Add ClientAliveInterval 120
  • Restart sshd service
  • I tried this option, but the result is the same – Sridhara Tv Feb 10 at 15:47
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Finally got the problem fixed. all the while I was using my mobile hotspot to connect. This is 4G connection and I get good internet speed and connectivity. For some reason I had changed the cellular connection type to LTE only on mobile to increase the speed, though it did not really improve the speed, caused this problem. when I reset back to LTE/CDMA which was the preferred network type, all things are fine now.

Thanks to all those who shared their views

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