Redirect external URL to an internally hosted application

I have created a application internally in my domain and the url for that internal application is https://server1.mydomain.local/something.

The users are accessing a public link https://abc.mydomain.com and they get the login page of Microsoft TMG. They login and when the credentials are validated they are redirected to https://server1.mydomain.local instead of https://server1.mydomain.local/something. I have used link translation and it is not working for me. 

I am using Microsoft Forefront TMG 2010. Please let me know if I am missing something or there is some configuration change that needs to be made.

Thank You