Have you engaged with Tableau Support yet? This sounds like an issue that our support team should help you investigate. You can create a case at http://support.tableau.com or via your portal account.
Please share what you learn.
In addition, I have moved this post to Server Administration should another Admin be able to assist.
Not yet.. was trying to figure out as to why a service account is throwing a Err code 16 while using tabcmd.
We changed passwords. kept it simple like test.. .no special characters..
I also gave a specific -t (site) so that it does not take the default site.
The only difference is, these servers were recently upgraded to HA configuration as well as 10.2.1
Well... post some investigation, it was found that the user account in picture was restricted on WinAD level to login to certain servers.
Closing this thread.