400 Bad Request when Sync via Sync Framework

i try to Sync a Windows Mobile Device with a SqlServer via Sync Framework.

It worked already but now i get a 400 Bad Request and don't know why.

The Service is available and i can open the wsdl in the internete开发者_JAVA技巧xplorer on the device.

Edit: I use a BasicHttpBinding.

Found out myself:

The name of the binding configuration in the binding itself and in the declaration of the configuration where diverent.