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How can I show detailed ASP errors?
By default, Windows Server hides application errors from your website. You can override this by adding the following inside a 'web.config' file that will cause IIS to output any errors to your browser:
<configuration>
<system.webserver>
<httperrors errormode="Detailed">
</httperrors>
</system.webserver>
<system.web>
<customerrors mode="Off">
<compilation debug="true">
</compilation>
</customerrors>
</system.web>
</configuration>