I have a server running W2K3. The computer acts as a DHCP, DNS and Firewall for a small network of about 10 computers (inside a larger network, that is no way connected other than by a fiber modem). This server will lose all connectivity to the internet after a few hours, but if the Static IP is changed, then changed back it works fine for another few hours. This happens once a day or sometimes several times a day. I'm not sure what could be causing this, but I can tell you it's causing me some real issues because I can't figure this out.
None of what was suggested resolved the issue. I have tried what was suggested and although I appreciate it, it was not successful in resolving my issue. I have added my ISP's DNS addresses back to the DNS on the Active Directory server. I would prefer to not have DNS on that server and use the ISP's because it is more reliable than ones i've used before. Any recommendations?