This error seems to indicate a general problem with your IIS setup, rather than a problem with FoxWeb. What happens if you try to get a simple (non-FoxWeb) page from your site? How about an .asp and an .aspx page?
Try searching for "HTTP Error 500.21" and you will find quite a few instances of people having this problem. The cause seems to be related to the ManagedPipelineHandler, but there are several causes. I suggest that you try the remedies recommended in each case.
You could check out the following article for some background information:
| FoxWeb Support Team |
Sent by sytze de boer on 12/09/2010 01:53:34 PM:
I'm just starting out and determining if this product is for me.
Sofar, this is all i can get
HTTP Error 500.21 - Internal Server Error
Environment is Windows 7 Ultimate 32-bit