Lync 2011: Mac - Sign into Microsoft Lync Failed because the service is not available

Hi Guys,

I am getting the above error message, there are already many threads with the same error but I just wanted to post our environment that we work with.

I am getting the above error message, there are already many threads with the same error but I just wanted to post our environment that we work with.

It does seem to be an issue with certificates missing; check log;

2016/04/08 11:50:14.454 FShouldUseProxy, is returning 1 
2016/04/08 11:50:14.455 Connecting to sipinternal.movember.com (port 0)
2016/04/08 11:50:14.455 InternalConnect, NLCreateConnection returned: -3176,
2016/04/08 11:50:14.455 FUsingHttpsTunnelProxies, returning: 0
2016/04/08 11:50:14.457 Listening thread got exception -3176
2016/04/08 11:50:16.492 InternalConnect, NLResolveAddress returned: -3176
2016/04/08 11:50:16.492 IsLocalAddress, 'sip.movember.com' is not a local address 
2016/04/08 11:50:16.492 FShouldUseProxy, is returning 1 
2016/04/08 11:50:16.494 Connecting to sip.movember.com (port 443)
2016/04/08 11:50:16.494 InternalConnect, NLCreateConnection returned: -3176,
2016/04/08 11:50:16.494 FUsingHttpsTunnelProxies, returning: 0
2016/04/08 11:50:16.494 Listening thread got exception -3176
2016/04/08 11:50:18.529 InternalConnect, NLResolveAddress returned: -3176
2016/04/08 11:50:18.529 IsLocalAddress, 'sip.movember.com' is not a local address 
2016/04/08 11:50:18.529 FShouldUseProxy, is returning 1 
2016/04/08 11:50:18.530 Connecting to sip.movember.com (port 0)
2016/04/08 11:50:18.530 InternalConnect, NLCreateConnection returned: -3176,
2016/04/08 11:50:18.531 FUsingHttpsTunnelProxies, returning: 0
2016/04/08 11:50:18.531 Listening thread got exception -3176
2016/04/08 11:50:20.565 InternalConnect, NLResolveAddress returned: -3176
2016/04/08 11:50:20.566 IsLocalAddress, 'sipexternal.movember.com' is not a local address 
2016/04/08 11:50:20.566 FShouldUseProxy, is returning 1 

The Mac's we use are not connected to our domain, users log into a local profile on their Mac's. Also we use Office 365 running Office 2016 apps.

Any help or advice would be appreciated.