Red Hat Bugzilla – Bug 97989
Heartbeat patch wanted for ssh client
Last modified: 2007-03-27 00:07:22 EDT
The stock OpenSSH distribution does not support a periodic "Heartbeat" (protocol NOOP) to
keep the connection alive. If a NAT device is in place between the client and server, and no
traffic is seen for some time, the NAT device will terminate the connection. Heartbeat keeps
this from happening (and should not be confused with TCP keepalives, which are different).
Several heartbeat patches on the Net exist. One is from here:
Another is provided with Debian; you should be able to find it easily.
FYI: stock OpenSSH now has these (ClientAliveInterval and
There is openssh-3.9p1 in the FC3.