Hi So here is what happened :-( I attempted to upgrade from Version 14 to 15. Did so after reading all documentation and the process completed without any errors. However the PBX simply did not work. Could not identify fault after many hours trying so rolled back to version 14 without making a version 15 backup. My only excuse was that I was a bit frustrated at the time Anyway is it the case that the SSL certificate I created during the failed upgrade to version 15 would have been saved in a backup, had I made one? If so, is it possible to recover it and attempt to install version 15 using the same FQDN (which I assume is now linked to my License key)? Thanks in advance for any replies.