SharePoint document library properties–“The request was rejected by the HTTP filter”

I published a SharePoint site today through TMG.  Everything looked great until you went to view/edit the properties of a document in a document library.  I got the following error:

“Error Code: 500 Internal Server Error. The request was rejected by the HTTP filter. Contact the server administrator. (12217) “


Trying the same actions on any other list/library worked fine; just not for a document library. 

The problem turned out to be related to HTTP filtering in TMG. 

To fix the issue, Open the properties of the firewall policy.  Click Filtering > Configure HTTP under the Traffic tab

Uncheck Verify normalization.


Save and apply changes and you should be all set.

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