I just applied SP8 to our dedicated NetStorage server (no replicas, only
NetStorage, no iManager, working fine for years). After the reboot, at
the NetStorage web page, I am continually prompted for authentication:
the login dialog pops up, I enter my username and password, click OK,
and the login dialog pops up.

I looked at a number of log files and can see no problems. I have
restarted it a number of times.

I have looked at the XTier registry entries with NoRM and they seem correct.

Now what? Where do I look for clues?