Unable to log into OWA despite using correct username and password

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Exchange 2003 Std on MS Windows 2003 SBS Premium w/ SP1
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Hi,

As of yesterday, nobody seems to be able to log into Exchange 2003 via the
OWA interface despite using the correct username and password. The OWA login
page is displayed correctly but when trying to login users get the following
in red over the username and password fields:

"You could not be logged on to Outlook Web Access. Ensure that your user
name and password are correct, and then try again."

The issue is affecting all accounts including the 'Administrator' account.

I confirm that the 'IUSR_<servername>' and 'IWAM_<servername>' accounts
appear OK (i.e. not locked out and login times are correct). I have reset
the passwords for both accounts and synched them using the 'adsutil.vbs SET'
and 'synchiwam.vbs' utilities as a precaution but with no success.

I have checked the event logs and there doesn't appear to be any entries
that relate to this issue (i.e. no entries that specify that there was an
attempt to log in using an incorrect username and/or password).

Access to Exchange via Outlook 2003 from client computers appears to be
working normally.

Can anyone suggest possible reasons and, more importantly, how to resolve
this issue? I believe the issue is IIS related but would welcome any
suggestions/comments.

Thanks in advance for any help.

Sergio



.

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