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Gateway IP & Outlook to Exchange Connect

By Kerry ·
I have my Win2000 desktops on NT LAN using the inside IP (private) address on Cisco firewall for gateway and when Outlook XP opens I get message indicating that Exchange Server 5.5 (SP4) is not responding, plus I usually get a prompt to retry or work offline. I usually only have to click retry once and then Outlook will connect. When I change my gateway to the public or outside address on my firewall, I don't get the 'not responding' message or even retry prompt, in fact, Outlook starts up rather quickly. But then Internet Explorer doesn't work--can't find any Web sites (whereas it did before with the private IP or inside address of firewall as gateway). I don't get it--it makes not sense to me. Anybody have an idea what's going on?

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Gateway IP & Outlook to Exchange Connect

by Kerry In reply to Gateway IP & Outlook to E ...

WINS servers are inside (private network addresses and same subnet as Exchange Server) and the DNS is outside (public, Internet) with the ISP.

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Gateway IP & Outlook to Exchange Connect

by shmaltz In reply to Gateway IP & Outlook to E ...

Again I'm almost sure this is a routing issue. Check the IP settings, since the workstation doesn't know how to reach the outside address of the cisco machine (since it has no route for that), Outlook resolves it faster because it most look on the LAN (it can't reach any machine outside your LAN, when it is setup this way, that's because it has no route to the gateway, if you however do have a route to the gateway - even when it is set to the outside address - then I know for sure that the routing is the problem, since it shouldn't have a route to the outside gateway). Make sure that the subnet mask for your LAN on this workstation is correct, and that the workstation has routes to the WINS/PDC/Exchange Servers.

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Gateway IP & Outlook to Exchange Connect

by Kerry In reply to Gateway IP & Outlook to E ...

Subnet mask is correct on ALL computers and so is LMHOSTS (includes firewall), but will add firewall to WINS. I believe firewall itself may be source of routing trouble, so working with Cisco engineer to check configuration. Thanks for suggestions.

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Gateway IP & Outlook to Exchange Connect

by Kerry In reply to Gateway IP & Outlook to E ...

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