Hi Pankaj -
Here's a guess for you: I see you using an instance of TabCmd in C:\tsi.portal\tabcmd. tsi.portal is a "test platform" often distributed by support for testing things like Trusted Tickets, and it is version 6.0 or older. I've had problems using this version of TabCmd to hit newer versions of Tableau Server (6.1+), regarldess of syntax.
By chance are you running different versions of Tableau Server on thescore.office.aol.com and aolsearch.office.aol.com? I'd bet you are, that aolsearch happens to be the same version as what you have in your tsi.portal folder.
Try copying tabcmd from the server you're having problems connecting to, along with the following support files:
Drop these into a different folder and see if you can use them to connect to the box in question. Bet you it'll work.