ubuntu@juju-df35bcc6-829d-423d-8aa9-d821573e62ae-machine-19:/opt/opendaylight-karaf/bin$ ./client -r 20 -h localhost -a 8101 -u karaf feature:list
client: JAVA_HOME not set; results may vary
retrying (attempt 1) ...
retrying (attempt 2) ...
retrying (attempt 3) ...
retrying (attempt 4) ...
retrying (attempt 5) ...
retrying (attempt 6) ...
retrying (attempt 7) ...
retrying (attempt 8) ...
retrying (attempt 9) ...
retrying (attempt 10) ...
retrying (attempt 11) ...
retrying (attempt 12) ...
retrying (attempt 13) ...
retrying (attempt 14) ...
retrying (attempt 15) ...
retrying (attempt 16) ...
retrying (attempt 17) ...
retrying (attempt 18) ...
retrying (attempt 19) ...
retrying (attempt 20) ...
Failed to get the session.
ubuntu@juju-df35bcc6-829d-423d-8aa9-d821573e62ae-machine-19:/opt/opendaylight-karaf/bin$