Unable to Login to Admin Page

Unable to Login to Admin Page

When I attempt to login to the admin page which is hidden from the Login Screen, the page tries to load and then goes back to the regular sign-in screen.
 
I am trying to access directly from the server the application is hosted on and the application is running on Port 80 with a SQL backend database.
 
I am trying to access via the following link:
 
 
Any ideas?

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