By default, IIS and ASP.NET hide detailed error information to prevent revealing sensitive information about your web application:
Sometimes you need to see error details (think shared hosting). Add these entries to your web.config file to disable generic errors:
<configuration>
<system.web>
<customErrors mode="Off" />
</system.web>
<system.webServer>
<httpErrors errorMode="Detailed" />
</system.webServer>
</configuration>
Resources
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