+# When the connection for a master is closed (e.g. logout of remote shell),
+# move the master connection in the background. If there's no other active
+# connection using the master, close it after x seconds. This prevents the
+# client of the master connection from blocking because it waits for all
+# connections using it to terminate which is very annoying. The timeout
+# prevents stale master connections.
+ ControlPersist 10