Hi Guys, About 3:30 this morning, my Windows Server 2008R2 decided to install updates and restart. Prior to this, everything was working fine. And then this appeared in the server logs... http://img26.imageshack.us/img26/23/eventlog.jpg This morning, I removed the updates that were installed (sorry i forgot to note what they were, though some were .NET), as this is the only thing that had changed - the system was working faultlessly prior to this. Things have changed a little since then... this is from the event log, having just re-started the server and all phones.. 10:46:30.790 [CM504001]: Ext.EndCall: new contact is registered. Contact(s): [sip:EndCall@127.0.0.1:40600;rinstance=dc84aa83dc2f8e28/EndCall] 10:46:30.785 [CM504001]: Ext.800: new contact is registered. Contact(s): [sip:email@example.com:40600;rinstance=4b74dbeebdeef6ea/800] 10:46:30.784 [CM504001]: Ext.777: new contact is registered. Contact(s): [sip:firstname.lastname@example.org:40600;rinstance=43e0f163cc8a9f17/777] 10:46:26.960 [CM504001]: Ext.*1: new contact is registered. Contact(s): [sip:*email@example.com:40000;rinstance=88ff44a4bea9a51e/*1] 10:46:26.959 [CM504001]: Ext.*0: new contact is registered. Contact(s): [sip:*firstname.lastname@example.org:40000;rinstance=cbe7614bd0265762/*0] 10:46:26.849 [CM504001]: Ext.*777: new contact is registered. Contact(s): [sip:*email@example.com:40000;rinstance=84fa0c6899f61202/*777] 10:46:21.555 [CM102001]: Authentication failed for SipReq: REGISTER 192.168.51.132 tid=f827636c7a15e80b cseq=REGISTER contact=DialCode@127.0.0.1:5488 / 2 from(wire); Reason: Credentials don't match, check that authorization-ID and password match the ones in extension settings 10:46:21.206 [EC100007]: External application is connected: application:SVR01:0/QueueManager local:127.0.0.1:5482 remote:127.0.0.1:49238 10:46:18.645 IP(s) added:[192.168.51.100] 10:46:17.778 [EC200005]: Parking Orbit server is connected: application:SVR01:0/3CXParkOrbit local:127.0.0.1:5482 remote:127.0.0.1:49224 10:46:17.594 [CM504008]: Fax Service: registered as sip:firstname.lastname@example.org:5060 with contact sip:email@example.com:5100;user=phone 10:46:17.445 [EC200002]: Media server is connected: application:SVR01:0/MediaServer local:127.0.0.1:5482 remote:127.0.0.1:49223 10:46:17.119 [EC200004]: IVR server is connected: application:SVR01:0/IVRServer local:127.0.0.1:5482 remote:127.0.0.1:49222 10:46:15.056 [EC200006]: Conference server is connected: application:SVR01:0/3CXConferenceRoom local:127.0.0.1:5482 remote:127.0.0.1:49218 10:46:10.207 [CM506005]: Public IP=xxx.xxx.xxx.xxx is used for WAN communications through local interface with IP=192.168.51.100 10:46:08.847 Failed to obtain short path name for [C:\ProgramData\3CX\Bin\Cert] 10:46:08.847 [CM501006]: Default Local IP address: [192.168.51.100] 10:46:08.797 [CM501002]: Version: 10.0.23053.0 10:46:08.797 [CM501001]: Start 3CX PhoneSystem Call Manager 10:46:08.797 [CM501010]: License Info: Load Failed - Error licence Licence: 27 System: 2 10:46:08.650 [CM501007]: *** Started Calls Controller thread *** 10:46:08.627 [EC200001]: Configuration server is connected: application:SVR01:5485/DBProvider local:127.0.0.1:49216 remote:127.0.0.1:5485 As you can see, none of the phones are connecting - there's 10 of them, all runing on extensions 100, 101, 102 etc... Can anyone shed any light on why this has happened and how to fix? Really need to sort this before the office re-opens on Monday. help! Thanks in advance to anyone that can help.