If yourservernameoraddress:1311 is added to IE's Intranet Zone, it will not prompt for a login and will simply use the users credentials (unless the Intranet Zone settings have been altered manually or through group policy).  A user in the local Administrators group (including, by default, Domain Admins) should be able to log into OMSA with their credentials (but the Active Directory box should remain unchecked).
Why does OMSA ask for credentials when running on a local machine sometimes? And then the credentials may or may not work, even for admin?...(Running 7.3 and 7.4 on various 2008R2 machines) Thx, JB
OMSA asks for credentials on Local machine