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DNS server are denied access to each other

I have 2 2008 R2 DNS servers and 2 2008 DNS servers that are on different network segments. The are connected by Point to point VPNs. When I try to access a DNS server on another segment from a local one I get an access denied error.

Any Ideas on how to fix this?

noci

A firewall in between needs to pass though UDP port 53 in both ways.
If zone transfers are needed also allow TCP port 53.

jimmylew52

ASKER

All traffic is allowed through the Point to point VPN.

noci

btw, what exactly do you mean by access denied...

nslookup fails?
or
you cannot connect using 'net use' or using rdp?
or
you cannot forward queries?
or
you cannot do zonetransfers?

they can ping?

or the VPN does not connect?
...
I think you need to be more precise.., the mentioning of DNS seems to implicate DNS problems..
Point to Point VPN means from the initiator only to the remote host only not from any other node on the network.. so one of the DNS's need to be initiating the point to point and the other DNS server needs to accept it.

jimmylew52

ASKER

Answers

nslookup fails? nslookup fails, eve with an entry in dns on the server
or
you cannot connect using 'net use' or using rdp? net use & RDP work by IP address
or
you cannot forward queries? cannot forward queries
or
you cannot do zonetransfers? zone transfers do not work

they can ping? ping works be IP address

or the VPN does not connect? VPN is up and functioning

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noci

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jimmylew52

ASKER

Parts of each answer attempt were part of the problem. Also the primary DNS server was not working.