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gileswr

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This may be a bit more of a network-type question, but someone may know the answer.

We have Kerio Connect installed on a windows 2003 server in our office. Our connectivity is provided by ADSL through a Draytek 2820 router. We are unable to connect to the Kerio server internally using the domain name assigned to our external IP address. I was actually unable to ping either the external IP address or associated domain name until I disabled the firewall on Windows 7 (didn't seem to have this issue on XP boxes), however this is now possible. When trying to configure an account in outlook using the kerio connector it fails as being unable to connect to the server.

If you specify the internal IP address it works fine.

If you configure the account externally, specifying the domain name it connects fine.

The problem seems to be with resolving the external IP address internally.

I have edited the hosts file to point the domain name at the internal IP address, but that is no good for laptops that need to be able to connect internally and externally.

What I had thought might be possible would be to tell the Draytek router to resolve internal requests for the mail.domainname.com to the internal IP address, but can't see whether that is possible. Either way - with the windows 7 firewall disabled I can ping the mail.domainname.com, just not connect with the Kerio Connector.

Any thoughts?
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zebby

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Do you run your own DNS server for internal name resolution?

If so you could create a forward lookup zone for you mail domain and create an A record for you mail server pointing to the internal IP.

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stupot1397

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Are you running active directory?

As you can connect with an IP address and not the domain name, then this is definitely a DNS issue.

If you are running AD, you will have a DNS server. Then you can get this setup without too much trouble.


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gileswr

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Apologies - actually got it fixed. The problem was with the Draytek router. The latest firmware (3.3.4 I believe) "broke" NAT loopback. Managed to get hold of an RC3 of the latest version (3.3.5) from Draytek which fixed this issue.

Thanks for your suggestions.
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uptimjeff

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just a thought...

relying on NAT loopback adds overhead to your router and potentially slows performance because LAN traffic has to be routed by the draytek.

If you use an internal DNS server, your clients/server communications can be direct without running through draytek.


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