2003 Windows Server possible DNS issues

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.

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Santosh GuptaConnect With a Mentor Commented:
1. telnet and check if your DNS server port 53 is opened.
2. check if root hints of dns is present and working.
3.run dcdiag /test:dns and share the result.
french44Author Commented:
Thanks for the help.  

I have found the issue.  Their DNS forwarders were set to a previous ISP's DNS servers.  Once I changed them to the correct servers it works correctly again.  

I found it when I was checking for root hints so I'll give you credit sgupta1181.  Thanks
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