Symptoms

When you set the property on a form to anonymous access, and then use the file / image attachment on a form.

Where you load a file towards the image attachment control then the image won't display / work. It seems that the file.ashx retrieval gives an access denied (via fiddler).


 

Diagnoses

For this to work we have to add a configuration to the web.config file of the Anonymous Runtime site.
 

Resolution

A configuration setting should specify whether user is allowed to download (or load) files while accessing control through Anonymous access.

The configuration setting in the web.config is the following:



Configuration should be set to true to allow attachment control to function correctly while accessing through Anonymous access.