Loss of Internet after 20min - No Domain Controller is avilable for domain due to no logon servers

Odd issue, 10 computers on network.  Connected to Server 2008

If a computer is restarted, the internet works for approx 20min then "Internet Explorer cannot display the webpage"
Error log shows: "No Domain Controller is avilable for domain due to no logon servers"

NSLOOKUP for <domain>.local

Server: Unknown
Address: 192.168.1.1

Our Network Address are 10.0.0.1 (etc..)

If I start a RD session to the TS server, it connects and I can get internet from there. (never an issue)
When one machine loses the internet after 20min, all others can still access internet.

??
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MoncapitaanAsked:
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Darius GhassemConnect With a Mentor Commented:
Go to clients computers make sure they are only pointing to Domain Controllers for DNS. Make sure Domain Controllers are pointing to themselves for DNS. Go to command prompt run ipconfig /all

Run dcdiag at command prompt post
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dlancelotCommented:
sounds like the computers are getting booted because of ip conflicts, try static ips perhaps?
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Darius GhassemCommented:
Make sure your systems only point to internal DNS servers you should not have any external DNS servers listed.

Post dcdiag
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MoncapitaanAuthor Commented:
How would I check DNS?

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MoncapitaanAuthor Commented:
Yes, Wrong DNS server. Its pointing to a 192.168.1.1 (should be 10.0.0.152)

This is issued by the DHCP server which assigns the same to the TS sessions.
Any clues as to where I make the change and what is causing?

Thanks so far.
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Darius GhassemCommented:
Explain a little more
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MoncapitaanAuthor Commented:
When the cmputer is switched on, it runs ok for 20min before losing Internet Access.
When I run ipconfig /all

it shows a 192.168.1.1 IP as the DNS, which is wrong.

HOWEVER, I have today discovered, someone in the office has plugged in a Netgear router without any configuration for them to access the network via WIFI. <-- Source of the problem.

By following the advice of dariusq I got onto the correct path.  Thanks.
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