Error: HTTP Error 500.19 (or 500) - Internal Server Error

Symptom

When attempting to connect to the Web Console, you get one of the following errors:

Cause

A global config setting for IIS is preventing the Web console from being accessed.

Resolution

1. Open the applicationHost.config file located in .../System32/inetsrv/config
2. Locate these sections: 
1. <location path=" " overrideMode="Deny">
2. <section name="validation" overrideModeDefault="Deny" />
3. Other locations within the file could cause the issue as well. Typically, there is a Deny somewhere that is prohibiting this site.
4. Change "Deny" to "Allow"
5. Restart IIS