F1 in BRFplus not working

Hello,

when I am pressing F1 in one of  the field of the BRFplus workbench, I receive an error message saying, that the service is not reachable, "Error 403 reason forbidden".

If is this a authority problem? if yes, which is the authority object I need? If this is a problem of an not existing service, which is the name of the service used to call the F1-help?

Thank you for your help,

Peter