Can you try the connection now again?
I was able to connect last week using the Web SSL VPN and initiating the tunnel connection from there, which downloaded an even earlier build of AnyConnect 3.1.
As of now I am still unable to generate any traffic through the UCM. I have installed Jabber on my local desktop and connected to the CUP server, but in the Connection Status window it shows that I am not connected to the Softphone. It indicates a network problem, but I am able to ping both the UCM publisher and subscriber.
I setup a Collaboration 10.5 sandbox yesterday afternoon. I downloaded and installed the AnyConnect VPN client linked to from the setup email. Whenever I attempt to connect to devnetsandboxlabs.cisco.com/rave04, I revceive the following messages in the log.
[2/3/2016 9:13:27 AM] Contacting devnetsandboxlabs.cisco.com/rave04.
[2/3/2016 9:13:27 AM] Connection attempt has failed.
[2/3/2016 9:13:28 AM] No valid certificates available for authentication.
[2/3/2016 9:13:29 AM] Connection attempt has failed.
I am using AnyConnect 3.1.09013 on Windows 8.1.