I use ssh multiplexing, from time to time my hosts are rebooted or not reachable but the ControlMaster is still active and keeps the connection details in the ControlPath file. When I try to connect in such a case there is a large timeout until ssh detects the connection is not valid any more and establishes a new master connection. Is there a way to shorten this timeout?
Currently I use a config like this:
ControlPath /tmp/ssh-%r@%h:%p ControlMaster=auto ControlPersist=600