SSHD mm_request_send: write: Broken pipe

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:  write:  Broken pipe Your box has been hacked.    Format and Reinstall. Be sure to run “yum update” at frequent intervals to keep your servers/VMs up-to-date!!     ...