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Connections with a Proxy Server

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by jeff anderson

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I am using MS Proxy2 and am trying to set it up with 2 NIC Cards to act as a firewall. I use WINS to connect with a remote Exchange server. I have the Proxy server set up so the
outbound card is plugged into a router I do not control and the inbound card is plugged into a hub. I can get out onto the internet but I cannot see the remote winserver or exchange server. The outbound card has a gateway and the internal card does not.
HELP

8 replies

by cavedweller

Did it work before you added the firewall/proxy server? If so, your firewall is probably blocking the ports that exchange uses.

by dao251

In order to access Exchange over Internet, the following ports has to be open on firewalls on both sides (well, outgoing connection on client side and incoming ones on server side):
1) TCP 135
2) TCP high-ports (>=1024)
There is a technique allowing staticalliy map only two of the high-ports on Exchange side and it is well described in MS KB.

I believe you better do not try to access remote WINS this way, both because of security and performance. Instead you can statically map remote Exchange name at your local WINS or even in LMHOSTS on client machine.

HTH

Dima,
Brainbench MVP for WinNT Admin
http://www.brainbench.com

by dao251

oh, forgot to mention, there is an RPCPING utility on Exchange CD. Use it to try your connection to separate connectivity problems of others.

by joshg

You will have to use the route add command. This will tell your Server about the other networks he can talk to through the router.

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