Test

This is to be done 10pm Mondayt 21 Sept 2020 to minimise interuption and allow Chris to recover if things go sideways.

tes/sshwrapper/__init__.py

@@ -411,6 +411,7 @@ class Ssh:
             sshcmd.extend([
                 '-L', '127.0.0.1:{localport}:{batchhost}:{port}'.
                       format(port=port, localport=localport, batchhost=batchhost),
+                      '-N',
                       '-O', 'forward', '-S', ctrlsocket,
                       '-p', sshport, '-l', user, host])
         else:
@@ -426,6 +427,7 @@ class Ssh:
                 '-o', "ProxyCommand={}".format(proxycmd),
                       '-L', '127.0.0.1:{localport}:localhost:{port}'.
                       format(port=port, localport=localport),
+                      '-N',
                       '-p', sshport, '-l', user, batchhost])
 
         logger.debug('starting tunnel with {}'.format(" ".join(sshcmd)))