Hi all,
Just so somebody else might find that info faster:
Users wanted to connect to their SBS exchange mailbox via OWA from the
LAN and from a different LAN (WAN connection via VPN).
They constantly received the "401 Unauthorized" error after 3 login
attempts.
The usual suspects such as authorization issues, proxy et al (as
described on the MS KB articles and others) did not solve the issue.
Finally, after checking the logfiles the problem was the SMTP address
of the users.
During SBS install it is recommended to use something like
mydomain.local for the domain name of the machine if it's not acting
as a server visible to the internet.
However, if another machine (such as a linux machine) is doing the
mail relay and proxy services, users sometimes are set up with their
smtp address being their name and the FQDN.
Now to be able to access OWA for these users an additional SMTP
address has to be added to their exchange profile giving their login
name plus the local domain (e.g. userlogon@mydomain.local).
This does not need to be the default smtp address. Just _one_ of the
smtp addresses has to match the local domain and bingo.
There are several solutions for this problem nicely described in
http://makeashorterlink.com/?O6B815737
HTH
Regards
Wolfgang
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