HTTP error [403] in "Add Forums Administrator User"-iView (Forum)

Hi All,

I need help with installing the forum functionality.

When I open the "Add Forums Administrator User"-iView I always get the following error message:

<i>403 Forbidden

You are not authorized to view the requested resource.</i>

In the log-file I found the following message:

<i>User tfelp4, IP address

HTTP request processing failed. HTTP error [403] will be returned. The error is [You are not authorized to view the requested resource.No details available].

I must say that my useraccount has Superadmin-Permissions...

The "Forum"-iView works without problems, but there are no forum catagories, cause they must be installed for using.

Hope someone can help me

Thanks in advance

Steve