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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

Our Network Address are (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.

Avatar of dlancelot

sounds like the computers are getting booted because of ip conflicts, try static ips perhaps?
Avatar of Darius Ghassem
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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How would I check DNS?

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Darius Ghassem
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Yes, Wrong DNS server. Its pointing to a (should be

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.
Explain a little more
When the cmputer is switched on, it runs ok for 20min before losing Internet Access.
When I run ipconfig /all

it shows a 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.