DirectAccess - RemoteNetworkAuthenticationFailure

Hi all

I set up a DirecAccess Infrastructure with Windows 2012 and Windows 8 Enterprise Client. After many different problems with the setup, the solution is almost working.

But, the DA connection is only working, if I disable the "DirectAccess Policy-ClientToCorpSimplified" connection security rule in the windows firewall. If the rule is disabled on the client computer, the direct access connection works like a charm and I'm able to access all ressources in our intranet. If i enable the rule, the connection state remains connecting and i have the RemoteNetworkAuthenticationFailure state when i run Get-DAConnectionState on the DA client.

Can anybody help?

Thanks in advance...

Urs