In most cases the problem is related to some configuration or setting on IIS or the environment. Chris can share additional information on what was the problem in his case from the ticket with the community.
However, in order to understand what is true problem behind the general exception, we will need additional information about the project and the environment - how the site was set, when did you start to notice the problem. Also attaching a trace log
of the reproduced issue would help us as well.
the Telerik team
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system and vote to affect the priority of the items