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IIS server won't authenticate

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7 replies

by driordan

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I have Outlook Web Access running on an Exchange Server behind MS Proxy 2.0.

When users connect from the LAN using the NetBIOS name of the Exchange server, they can check their mail fine. But when they try to connect from outside, they get the logon screen, and after they put in their alias, they get the authentication pop-up. But their password is not accepted and after 3 attempts, they get an HTTP 401.1 Unauthorized: Logon Failed error.

If I try to use the FQDN to connect to the Exchange server from inside the LAN, I get a Page Not Found error, but I think that may be a different problem.

The only change that I can remember making is that I took the proxy server out of a chain; it had been forwarding everything to an external server for filtering, but is now doing the filtering itself.

Any suggestions?

7 replies

by astute

Its just an hint,

Windows NT Authentication will NOT work via Proxies ( I am not sure abt MS Proxy, but with other http proxies it will not work)
so may be this this is the reason.

Good luck,

by dc1

MS Proxy does support Nt authentication so the first answer is incorrect in regards to MS Proxy. Verify that that there aren't any existing rule sets that have been inherited fom the chain's config left over. Also verify that the necessary ports are open on the proxy to communicate to your back-end.

by anthony.biondo

If the client is using Netscape they will not be able to get in because Netscape does not support Challange Response. You did not specify the browser they are using.

hope this helps,
Anthony Biondo

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