Currently testing with the following sshd options:
TCPKeepAlive yes
ClientAliveInterval 30
ClientAliveCountMax 100

The sshd logging on disconnects is now a bit different.
The "Timeout, client not responding." isn't happening anymore.

However, the session is still closed:
Feb 4 08:33:45 ip-10-4-40-213 sshd[2195]: pam_unix(sshd:session): session closed for user ec2-user

This could mean that the problem isn't in the ssh connection disappearing, but that somehow the slave process is terminated or the master terminates the connection.

I tried bringing the number of executors down to 1, didn't help.
Now we're testing with a bigger EC2 instance (C3XLarge instead of C3Large) and with a larger Java heap for the slave process (-Xmx2048M).

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