We have a 2003 Windows server that is acting as pdc, dns & dchp. We haven't changed anything for quite awhile but all of the sudden today nobody can access the internet if the dns is pointing to that server. I didn't have a secondary dns setting but I added the router's local IP as the secondary so that they could have internet access again. I'm pretty sure there must be an issue with the dns but I cannot figure it out. From the server if I have just it's own IP address the only dns server, nslookup will not resolve anything. Should I just rebuild the dns server or is there an easier fix, or something else to look at all together? Like I mentioned earlier, everything was working great for a long time but something just happened out of the blue.