I have a server running Ubuntu server 12.0.4 with Openssh-server installed. I can connect to the server for about 30 minutes and then the connection drops. When I try to reconnect I get The remote system refused the connection..

I have used ps -A | grep ssh to verify that the the sshd is running, and I can ssh back to and stay connected indefinitely.

I have also tried adding ClientAliveInterval 60 in /etc/ssh/sshd_config which made no difference.

1 Answer 1


Check cpu load and memory utilization on server.May be due to high cpu load/memory.You are facing this problem.You can use free uptime vmstat top and others tools to figure it out and also check tail -40 /var/log/auth.log for more info.

  • 1
    I did some digging... I found that the processes for my connections were still running, and once these were killed, I could SSH back in to the server. Oct 1, 2013 at 19:19
  • The server memory load is at 3% Oct 1, 2013 at 19:27

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