Howdy! Yesterday around 4:45pm we started getting this message on all outbound calls. Inbound works great. Internal to internal work great, incoming from the outside are fine. 0.0.0.0 replied: 503 Certificate Validation Failure; warning: No other DNS entries to try (11,0); internal We have rebooted the PBX etc. We are using Fusion Connect IP Register. No configuration changes ocurred and we are able to do an NSLOOKUP and resolve the server name in our configuration to 2 IPs. 3CX 15.5.8801.3 Name: ln01-05.fs.broadvox.net Addresses: 188.8.131.52 184.108.40.206 Any ideas?