I am having a heck of a time getting OA working. I belive ISA 2006 to be setup properly.. I can autheticate and Access the /rpc directory from external. But cannot get my client configured.The ISA webslisten is using HTML Form AuthenticationOutlook Anywhere rule uses Basic Authentication - Testing rule shows all vdir are green./Rpc directory on CAS server uses basic authenticationI setup Outlook proxy settings to use Basic auth.I see the connection failing on ISA serverFailed Connection Attempt USTSxxxxxxxxx 12/15/2008 12:37:55 PM Log type: Web Proxy (Reverse) Status: 0x80004005 Rule: Outlook Anywhere Source: (xxx.123.156.xxx) Destination: (146.xxx.xxx.xxx:443) Request: RPC_OUT_DATA http://webmail.xxxxxxx.com/rpc/rpcproxy.dll?exchmbx.corp.xxxxx.com:6004 Filter information: Req ID: 139501b0; Compression: client=No, server=No, compress rate=0% decompress rate=0% ; FBA cookie: exists=no, valid=no, updated=no, logged off=no, client type=unknown, user activity=yes Protocol: https User: anonymous Additional information Client agent: MSRPCObject source: (No source information is available.)Cache info: 0x8 (Request includes the AUTHORIZATION header.)Processing time: 1 msMIME type: I also see this error on the cas serverRPC_IN_DATA /Rpc/RpcProxy.dll - 443 - xxx.123.xxx.84 MSRPC 401 1 0

Hi, Is there any certificate installed on ISA server? 1. Please try to browse Http://webmail.xxx.com /rpc/rpcproxy.dll internally. We need to narrow down the root cause of the issue. If we can browse that url, then we assume it could be the ISA related issue. 2. Please follow the article below to check the configuration on ISA. http://www.msexchange.org/tutorials/Outlook-Anywhere-2007-ISA-Server-2006.html 3. Please run Test-OutlookWebServices from Exchange Management shell and post the output here. 4. Please use RPC ping to check the connectivity between Exchange Server and client. Besides, please try to create a rule for Autodiscover and allow anonymous access. http://www.isaserver.org/tutorials/Publishing-Exchange-2007-Outlook-Autodiscover-2006-ISA-Firewalls.html More related information share with you: Troubleshooting RPC over HTTP Communications http://technet.microsoft.com/en-us/library/bb124649(EXCHG.65).aspx How to use the RPC Ping utility to troubleshoot connectivity issues with the Exchange over the Internet feature in Outlook 2007 and in Outlook 2003 http://support.microsoft.com/kb/831051 Publishing Exchange Server 2007 with ISA Server 2006 http://technet.microsoft.com/en-us/library/bb794751.aspx Best regards, Xiu