I get 404 error when download attachment from IIS7

If your attachment name contains a space symbol, you may get "HTTP Error 404.11 - Not Found" error when you try to download it. This commonly happens on IIS7 servers.

Here is an example of this error. Pay attention to the "Things you can try section". It includes information about cause of the error.

To fix this issue, follow steps below.

1. Open IIS Manager.
2. Select the website with KMP.
3. Double-click on "Request Filtering".
   
   
   
   
4. Select "Hidden Segments".
   
   
   
   
5. Select "web.config" and click "Edit Feature Settings..."
   
   
   
   
6. Set checkbox on "Allow double escaping" and click OK.