ZCC does not work on updating to latest Firefox Browser version 39.0 . This issue also reported with Firefox ESR 31.8.0 and 38.1.0.
ERROR : Secure Connection Failed
An error occurred during a connection to XXX.XXX.XXX.XXX . SSL received a weak ephemeral Diffie-Hellman key in Server Key Exchange handshake message. (Error code: ssl_error_weak_server_ephemeral_dh_key)
This is fixed in version 11.4 - see KB 7016614 "ZENworks Configuration Management 11 SP4 (11.4.0) - update information and list of fixes" which can be found at https://support.microfocus.com/kb/doc.php?id=7016614