VMware workbench proxy settings?

Hello,

I try to get the VROps 6.x certification running in my workbench appliance V3.5, but I do not find the right proxy settings. If I use the firefox browser in the appliance, my proxy settings work perfectly well. But in the workbench I can't access the on demand questionnaire and no other web sites in the internal web browser either.

What can be wrong here?

I attached screenshots of my proxy settings in workbench(wb) and Firefox(ff).

Thanks in advance

Alfred