The testing server was defined ok. But what I didn't noticed was that the database connection file wasn't copied to the testing server, after I copied the database connection file to the server everything was allright. Sorry for taking your time (it was early in the morning for me) and thanks for putting me on the right trail.
Maybe another question, but I hope you can give an answer:
I create a site on my own server for a good friend of my with powercms. So at least I have some control of what version of php will be running at it. But I 've read that you guys are updating Databridge and Design Extender for work with mysqli. If so will the powercms be able to be updated to the version that uses mysqli in the near future?
PLease keep up the good work and thanks for your answer!