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.