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Unable to access company Internet site from domain with the same name.

Posted on 2004-08-18
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Last Modified: 2010-03-18
We have a Windows 2000 Small Business Server running a single NIC internet access solution.  It uses the domain internally of say 'mydomain.co.uk' with a local IP range of 192.168.0.xxx.  Everything works fine unless you try and access the domain on the internet as say'http://www.mydomain.co.uk' i.e. the internal and external domains are the same.  The external pages are unavailable with the error 'This Page Cannot be Displayed' etc...  If you PING the 'www.mydomain.co.uk' the error 'unknown host' comes up.  The Internet domain is separately hosted and has a pingable external IP address.

This used to work with a dual NIC solution but VPN through a hardware firewall was required and this necessitated the shift to a single NIC solution.

I'm sure it's a DNS entry (or entries) but an entry for 'www' in the forward? lookup zone with the correct IP then allows PING to work but browsing the URL fails as before and the IP by itself gives the ISA Firewall login!

Can anyone help please?

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Question by:P_Robinson
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by:nagraves
ID: 11834550
What I gather, your network has a single external IP address with multiple internal addresses. If you're on the internal network with a private ip address, and you try connecting to your network's exteral IP address to view a , it will not work.
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by:nagraves
ID: 11834564
What you might try doing is adding the internal IP of the webserver to your hosts file on your desktop computer.
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by:adamdrayer
ID: 11834755
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by:P_Robinson
ID: 11879616
It seems that everyone is assuming that the web server is internal when infact it is external and hosted by an independant ISP.  The solution is not therefore the same as Q_21097147.  At the time the network was set up, it was suggested that the server was set up using an internal domain identical to the company's external domain.  In hindsight this may not have been good advice.

The internal network has no connection with the external internet site whatsoever apart from the domain name. 'server.mydomain.co.uk' is the internal server and 'www.mydomain.co.uk' is an external, independant location.

Does that help clarify the problem?

Thanks
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by:P_Robinson
ID: 12007701
Solution

Following a discussion with Microsoft themselves, it appears they hadn't come across this little 'quirk' either.

It took a little while but the resolution was to remove the entry '*.mydomain.co.uk' from the LDT (Local Domain Table) in the ISA Server - Network Configuration.  Once the ISA service was stopped and restarted then it worked fine.

Thanks again for the input.

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