I have a user with a Nokia E62 trying to sync with my server (4.5.4 NETWORK) and I get '401 Unauthorized' messages. Two other users sync correctly with HP iPAQs (one of them myself)
The only difference in the logs is that the Nokia tries to log in I see this in the logs (slightly obfuscated):
INFO [http-80-Processor96]  sync - OPTIONS Microsoft-Server-ActiveSync?User=mydomain.com%5Cuser&DeviceId=IMEIn umbers&DeviceType=IMEInumbers
and when the iPAQs do I see this:
INFO [http-80-Processor79]  sync - POST Microsoft-Server-ActiveSync?User=user&DeviceId=32799A62EA5DD7D3B455 844A24AA1AF5&DeviceType=PocketPC&Cmd=Ping
The difference is the domain%5C part.
Is this a known bug fixed in 4.5.5 or .6? or in a newer version of the nokia app?
One additional data point is thas we use an external LDAP server for authentication.