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DNS lookup failure

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I hope someone can help me out. I'm running a school network. One morning I started seeing errors in the eventviewer and no one was able to log onto our internal network. Roaming profiles are not being loaded because "there is no server to handle this request". I'm seeing warnings and errors such as:

- Access denied attempting to launch a DCOM server
- The attempt to establish a replication link is failing because of a DNS lookup failure
- The DNS server was unable to open zone in the Active Directory
- The DNS server did not detect any zones so will run as caching-only server

I already checked the IP configurations, did the pinging magic, and all return good responses. I have exhausted all my resources and cannot figure out what is going on. Any ideas where to start on this?

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    Je suis Napoléon!

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for the first error


some of that is in english....thats for the third error in you list


this is technically for the last one but has a little bit of all of them in it
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