I installed DirectAccess about a month ago and everything has been very solid with no issues. Starting yesterday the only way a user can connect to Direct Access using a broadband device is disabling 6to4 on clients computer.  I have tested with multiple computers and same thing.  Any thoughts on why I have to disable 6to4 (netsh int 6to4 set state disabled) before a user can connect to DA? It was working great before.

Server: 2012 R2

Clients:  Windows 7

Hi

It's a common problem with some Broadband service providers. In some cases IP41 protocol is blocked and does not permit 6to4 to work properly. Have a look at this thread.

http://social.technet.microsoft.com/Forums/forefront/en-US/49cc8434-2a32-4339-90ef-0f2ccf0ba8a7/connect-to-uag-direct-access-only-disable-6to4?forum=forefrontedgeiag

At last, 6to4 is to be depreciated, to disable it.