I cannot seem to get direct access to work using anything but the Teredo tunnel. Clients don't activate either the 6to4 or the IPHTTPS connections. The clients look like this. When connected with Teredo.. C:\Windows\system32>ipconfig Windows IP Configuration Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : llc.mycompany.com Link-local IPv6 Address . . . . . : fe80::3179:a04c:69ac:a657%2 IPv4 Address. . . . . . . . . . . : 10.0.0.101 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 10.0.0.10 Tunnel adapter isatap.llc.mycompany.com: Connection-specific DNS Suffix . : llc.mycompany.com Link-local IPv6 Address . . . . . : fe80::5efe:10.0.0.101%13 Default Gateway . . . . . . . . . : Tunnel adapter Teredo Tunneling Pseudo-Interface: Connection-specific DNS Suffix . : IPv6 Address. . . . . . . . . . . : 2001:0:ada4:2099:3856:139b:525b:df62 Link-local IPv6 Address . . . . . : fe80::3856:139b:525b:df62%14 Default Gateway . . . . . . . . . : :: Tunnel adapter iphttpsinterface: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . :

Hi, Thank you for post here. First of all, please understand that you can enable 6to4 transition topology unless you have public Ipv4 addresses on the client side. Once Teredo traffic cannot reach the DA server, DirectAccess will attempt to use IP-HTTPS. Will IP-HTTPS tunnel work if you disable the Teredo? For more information about IP-HTTPS troubleshooting, please check: Cannot Reach the DirectAccess Server with IP-HTTPS http://technet.microsoft.com/en-us/library/ee844126(WS.10).aspx