DNS & VPN problems. Changed ISP, lost VPN functions!

[beno78]

I have just linked three sites together(A, B & C) via a VPN to allow some basic file sharing and calandar sharing. Site A has a server running DHCP, exchange and file sharing. All was working ok, untill I changed ISPs, and now all I can do is ping each site across the network. I cannot connect to the exchanger server at all(which I am only using the calendar function), I cannot map any drives on the main file server, and I cannot add any of the external PCs to the domain and set up trusts.

I have done troubleshooting and found this…
- I can ping the server at location A via IP and its DNS name from all sites
- All PCs at sites B & C have full internet connectivity when using the ISP’s DNS servers
- If I add the servers details at location A the hosts file on PCs at B & C, I can ping, but still not able to map a drive, get exchange or add to domain
- Same result if I add the server as the DNS on each PC

Its got me stuffed, as it was working ok on the previous ISP, when using thier DNS servers, but now I cannot do anything besides PING, which indicates to me that its not a VPN problem, but more like some sort of DNS issues.

OTHER INTERESTING RESULTS
I can get a web page, and ping

http://www.google.com

for example, but I cannot get any network resources, and all errors I get are referring to DNS.

I am able to ping my DNS server, but nslookup fails...
C:\Documents and Settings\peterc>nslookup server
*** Can't find server name for address 192.168.0.252: Non-existent domain
*** Default servers are not available
Default Server: UnKnown
Address: 192.168.0.252

tracert 192.168.2.254
Tracing route to 192.168.2.254 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms 192.168.0.254
2 * * * Request timed out.
3 37 ms 39 ms 88 ms 192.168.2.254
Trace complete.

The PCs at sites B & C are able to use the DNS server to resolve web addresses, and all PCs can access the internet when pointed to my internal DNS server.


I have been stuck on this for 2 days, and its doing my head in!! HELP!

 

[beno78]

I have noticed that I if I try to login to the Web Interface on my routers, I get asked for authentication, which if I enter wrong, tells me so. If i enter the correct details, the page loads about 2% and stops, eventually timing out with the standard web error.

 

[GlenJohnson]

What kind of error messages are you getting? How about the log files?

Glen A. Johnson
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