When the configured LDAP server is not reachable, the server process exits with error level "1".

W20170108-17:10:19.776(1)? (STDERR) events.js:141
W20170108-17:10:19.778(1)? (STDERR) throw er; // Unhandled 'error' event
W20170108-17:10:19.779(1)? (STDERR) ^
W20170108-17:10:19.779(1)? (STDERR)
W20170108-17:10:19.779(1)? (STDERR) Error: connect ECONNREFUSED 212.204.89.242:636
W20170108-17:10:19.780(1)? (STDERR) at Object.exports._errnoException (util.js:911:11)
W20170108-17:10:19.780(1)? (STDERR) at exports._exceptionWithHostPort (util.js:934:20)
W20170108-17:10:19.781(1)? (STDERR) at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1076:14)
=> Exited with code: 1

We should take care for this situation and show a user front end message telling to call for admin help and try again later...