+# Abort if not all requested port forwardings can be set up.
+ ExitOnForwardFailure yes
+
+# Allow using -M (ControlMaster) to create a master SSH session which
+# "tunnels" other connections to the same host, thus reducing the number of
+# authentications (which are relatively slow) and TCP connections. The master
+# sockets are stored in ~/.ssh (by default ControlPath is not set).