My domain environment is no longer functioning. All of a sudden I could not access the Internet throughout our school network. Actually, web pages will open up, but after an extremely long period of time (maybe 5 minutes to load google.com). I Have two errors in DNS event log. First is The DNS server has encountered a critical error from the AD. Check that the AD is functioning properly. The second error is The DNS server was unable to complete directory service enumeration of zone cec.local. This DNS server is configured to use information obtained from AD for this zone and is unable to load the zone without it. Check that the AD is functioning properly and repeat enumeration of the zone.
I have two DNS servers and both have existed for a couple of years. When I try to do an nslookup command from my workstation I get the following message: "Can't find server name for address 172.16.4.1 (my DNS server): non-existent domain
Default server: unknown
How can I go about fixing this problem?
Thanks so much for your help.