This problem may occur when the Client Access server has Integrated Windows Authentication enabled. Unified Access Gateway tries to authenticate to the Client Access server by using credentials that you specified in the New Profile Wizard. In this case, the domain name is added as a prefix so that your user name resembles the following:
NTLM authentication is unsuccessful when a user name uses this format. This authentication failure causes Unified Access Gateway to return an HTML error page to the client, and this causes the New Profile Wizard to stop responding.