Can't login to "Managed System Login" (OMSA)

Hi all,

  I've just successfully created a pushed a deployment task for installing OMSA 7.1.0 on a 2008 R2 server.  However, while I'm logged into the server with my AD creds, I go to open OMSA from desktop icon but my login fails EVERY time on the "Managed System Login" page.  I can login fine when signing into Manage Web Server... I've tried various different admin accounts and still cannot seem to login.  Any ideas?

I've researched this problem a bit and have tried the solutions given -- entering managed node IP address rather than host name, etc.