My domain environment is no longer functioning. All of a sudden I cannot 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 Address: 172.16.4.1 How can I go about fixing this problem? Thanks so much for your help. Sean Kenny

Hi Sean, Can you post an output of ipconfig /all from the client and DNS server in question. BrentPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.