Ask the Expert

Forest sub-domain users cannot access OWA

I have a Microsoft domain forest and two sub-domains under the forest -- like, and All server operating systems are Windows 2003 with the latest patches. I have two Exchange 2003 servers under One is a mail server and the other is an Outlook Web Access server. I have one mail server under domain and one mail server under domain. They are all Exchange 2003 and with the same organization.

However, when we set up the Outlook Web Access under, we could see and authenticate with the user under only. Other users under and couldn't access the Outlook Web Access server.

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Are you getting any error messages? Are you able to see the authentication screen? Are users able to authenticate from inside your network? Check your Exchange Outlook Web Access settings, as well as the IIS settings on the sites. Try specifying the domain before the user's name such as

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Related information from

  • Tip: Rewriting Exchange addresses
  • Resource Center: Outlook Web Access tips and resources

  • This was first published in January 2006

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