View errors remotely in IIS7

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By default, IIS7 blocks error messages from being viewed remotely.

This also applies to PHP sites such as WordPress hosted under IIS7 which by default might display a 500 error without the following config changes.

To enable the viewing of error messages add the following line to the <configuration> section of your web.config file:
 

    <system.webServer>
        <httpErrors errorMode="Detailed" />
    </system.webServer>
 

If you don't currently have a web.config file it should look like the following:
 

<configuration>
    <system.webServer>
        <httpErrors errorMode="Detailed" />
    </system.webServer>
</configuration>