We have an SBS 2003 Server that has developed what I believe is a DNS fault. It is a domain server used for DNS, DHCP, file server and exchange duties. About 24hrs ago it became apparent that any internal clients, also external clients connecting via VPN were not able to display web pages. It was also noticed that the server itself was unable to display web pages. The unusual thing is that a number of services are still working such as Skype, Exchange is still sending/receiving emails for both internal and external clients, RDP and file access. So the only thing that doesn't seem to be working is displaying web pages.
The steps already taken in an attempt to resolve this are Winsock repair, checked Forward lookup, replaced router. None with success.
Any suggestions would be appreciated.