I just figured something out. I am able to use the MySQL Admin tool from my remote Windows PC to connect to the database using the username/password and make changes to the database.
This error might have nothing to do with not being able to connect:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@xxxxxxxxxxxxx.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.