A Web exception occurred because an HTTP 503 - ServiceUnavailable response was received from Unknown

Posted by Dai on Server Fault See other posts from Server Fault or by Dai
Published on 2012-09-25T03:18:01Z Indexed on 2012/09/25 3:39 UTC
Read the original article Hit count: 3633

Filed under:

exchange

|

outlook

|

outlook-anywhere

As far as I can tell my Exchange 2010 Mailbox and Client Access server is working fine except for Outlook Anywhere.

I fired up the Exchange Connectivity Tester and ran it against my server and I get this report:

Part 5
Testing HTTP Authentication Methods for URL https://mail.contoso.com/rpc/rpcproxy.dll?server6.corp.contoso.com:6002.
The HTTP authentication test failed.
Additional details: A Web exception occurred because an HTTP 503 - ServiceUnavailable response was received from Unknown.

When I do a search for "ServiceUnavailable response was received from Unknown." I get only a couple of relevant results, including a 22k-view Exchange Forum thread, but none of the solutions discussed help.

There is nothing of relevance in the server's Event Log.

mail.contoso.com is the public domain name of the CAS/MB/HT server. server6.corp.contoso.com is the internal domain name of the server.

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