The customErrors element has a mode setting
- Specifies that custom errors are enabled. If no defaultRedirect attribute is specified, users see a generic error. The custom errors are shown to the remote clients and to the local host.
-Specifies that custom errors are disabled. The detailed ASP.NET errors are shown to the remote clients and to the local host.
- Specifies that custom errors are shown only to the remote clients, and that ASP.NET errors are shown to the local host. This is the default value.
Make sure that you are using the proper mode depending on the way you are accessing the website. Sitefinity itself does not change settings of customErrors element and how the request will be processed, so if the web.config settings are fine, then the problem is in your IIS settings and custom errors set there.
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