You are attempting to login to a Linux machine (probably CentOS) and your SSH sessions are instantly disconnected.
/var/log/secure shows various Signal 15 crashes and this error:
mm_request_send:Â write:Â Broken pipe
Your box has been hacked.Â Â Â Format and Reinstall.
Be sure to run “yum update” at frequent intervals to keep your servers/VMs up-to-date!!