Hi,
Security environment of UWS has changed compared to legacy Cassini server. A combination of factors like host process identity, ASP.NET request processing thread identity, whether the impersonation is turned on, etc, may affect your application's ultimate security context.
For quick path to the solution, please refer here:
http://stackoverflow.com/a/21852205/516508
For more details on ASP.NET and UWS security, go to http://localhost:7756 on the system where UWS is installed.
Best regards,
UltiDev Team.
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