Windows 2008 - incorrect user or password

Hi,

Im using pocketcloud android on my Galaxy S2 (Android 2.3.3).
I try to connect to my company server (Windows 2008) via RDP and wifi or LAN.
In both cases, i get a "user or password incorrect" on the startscreen.
When i type user und password manually over pocketcloud, the same error occured.
With my notebook (Windows 7) there are no problems.
Any suggestions? Tnx.

regards
Mike