Hi!
If you have a "system.webServer" section in your web.config, make sure you also have corresponding settings in "system.web" as well, because "system.webServer" is an IIS7/8-specific section and if some settings are specified only there, it makes your application IIS7/8-dependent, and incompatible with IIS6 and UWS. In most cases if you can make you app work for IIS6, you can make it work for any web server, including UWS.
Please let us know if this information has helped.
Best regards,
UltiDev Team.
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