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Thanks for responding. The W2K boxes are set to obtain DNS servers automatically. I'll check the ISP's web site to see if they have a list of IP numbers for the DNS servers. Is there another way to determine the DNS server IP addresses without contacting the ISP?

I do believe that the problem lies with the W2K machine's ability to contact the DNS servers. All the other clients here, they are all on Win9x, are operating without any loss of service. When the W2K machine's internet access goes down, you receive nothing but a DNS error page when using URLS, but by typing FR's IP address in the address bar, the page comes up.

I'm away from the machines until Monday. I will spend what time I can researching my ISP's DNS server addresses and W2K's handling of DNS. Unfortunately, the problem is intermittent, occurs at random times, and resolves itself after a period of anywhere from 1 to 4 hours.

To add even more difficulty to the situation, the machines are in almost constant use during business hours limiting the time I can spend trying to diagnose the situation. The fact that I have only an elementary understanding of networking terminology and protocols adds to the level of frustration. </whine

Thanks again for responding.

It looks like I can determine the DNS server IP addresses by typing "ipconfig /all" at a command prompt. I'll try this with the internet working and with the service down to try to determine if it's a problem with my ISP's servers or with the W2K machines's handling of DNS.

I'm really leaning towards a fault with W2K's DNS handling because it seems like the Win9x clients would also experience DNS errors if it was the ISP's servers, no?