I have setup a Server 2003 machine as a NAT Router for sharing Internet utilizing one public IP provided by my ISP.
My private network is a Server 2008 R2 based Active Directory Domain. I also have implemented Network Access Protection using NAP DHCP. My problem is that occasionally some AD clients are loosing internet connection for a period of time. Sometimes for about 10 to 15 minutes and the clients get the Internet connection back without having done anything.
While the clients are without internet access they are able to ping the Server 2003 router but could not ping any internet sites. However other AD clients are fine and they are able to connect to the Internet.
I have searched for a clue and am helpless. Can anyone point me to any resource where I can troubleshoot this issue?
Thanks in advance