Windows – Server 2012 – migrate roaming profiles to user profile disks

Your connection broker should not be in collection.domain.com, only the session hosts should be. The session hosts talk to the session broker, not the clients.

You need to begin a process of elimination - Windows does lots of things while the "Welcome" screen is spinning, but the good news is that most problems will be logged in the event log.

Here's the kind of things I'd be doing:

1. Does it still do it if the user has no roaming profile configured?
2. Does it still do it if NO group policies are applied to the user and station?
3. Does it take a long time for a local user to logon? How about local administrator?
4. Does it take a long time to logon using a cached profile (I.e., with the network cable unplugged?)

Hopefully, by doing the above, you can start to eliminate certain causes and narrow down your investigation. Here is an excellent article by Mark Russinovich on getting into some really low level diagnostics:

http://blogs.technet.com/b/markrussinovich/archive/2012/07/02/3506849.aspx