RDWeb (RD Gateway) login fails with error - the logon attempt failed

Issue

Windows Server 2012 server with RD Web and RD gateway roles. 
Remote Windows 7 client trying to login to a workstation via RD Web website

User can successfully login to the RD Web (Work Resources) website. However, secondary login to the actual Remote Desktop Gateway fails with error:

Windows Security - The logon attempt failed

Windows Security
The logon attempt failed

Resolution

The issue was cased by incorrect Default Web Site HTTP redirect on the Windows Server 2012 (IIS Manager).

IIS Manager - HTTP Redirect

Option "Only redirect requests to content in this directory (not subdirectories)" was not checked. After enabling this option, login errors went away.

Windows Server 2012
Windows 7

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