I have the same issue as https://www-secure.symantec.com/connect/forums/nbu-7601-upgrade-nbac
What was the resolution to this issue? I am experiencing the same exact issue with an upgrade from 7.1.0.4 to 7.6.0.1.
NBAC was working as expected in 7.1.0.4, but after the upgrade to 7.6.0.1 I get the error "unable to retrieve the version of the server <master serever name>" when opening the administration console. Setting USE_VXSS to PROHIBITED allows the console to open.
I have had a case open with Symantec for a week now, but so far no luck with finding a resolution, so far their suggestion has been to install 7.6.0.3 and 7.6.0.4. Obviously that solution would have been too easy, so ofcourse it didn't resolve the issue.
