WDS doesn't accept credentials

Hi,

I spent long time searching to solve my problem but cannot find identical. So you're my last hope ;-)

When I start PXE at startup choose for deploy, after setting the language and keyboard settings en before choosing the image I have to give in administrator credentials but this is not accepted. (and yes it's correct, including domain)

I tried an other new server which experience the same problem. When I do the same on the server I created the image with, it is accepting the same credentials.

Does anyone have any suggestions?

Thnx in advance.