Until now, we have found 2 main causes for this issue.First cause
: Windows stored the wrong password in the credential manager and cause the connection failure with the hostname.
On windows 7, find the credential manager in the control Panel :
In Windows 2003, you should find "Stored User Names and Passwords" in the control panel.
Here an URL about Stored Password : http://technet.microsoft.com/en-us/library/cc758058(WS.10).aspxSecond cause
: A Time difference caused by the DST (Daylight Saving Time).Example : If you disable DST on the domain controller, enable DST on the NAS and set the correct time on the NAS, then the authentication will work with the IP (using NTLM) and it will fail with the hostname(because in this case the PC will try kerberos authentication with the domain controller, and will reject the connection because of the time.)
Make sure that the Time-zone on the NAS, on the Domain controller and on the Client PC are the same.
Also, please synchronize the time of the NAS with the Domain controller using NTP :
System Administration > General Settings > Date and Time
Then configure the synchronization with your Domain controller.
If after the synchronization you have 1 hour difference, check your DST settings.
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