We recently upgraded from NSM 2.5.2 to NSM 3.0.1. After the upgrade the web interface for Quota Manager gives a "Login Failed" error message. I had found a post where someone had a similar experience after that upgrade and he said that he had exported the storage policies, rebuilt the server and did a fresh install of NSM 3.0.1 to resolve the issue. That did not work for me.

So right now we have NSM 3.0.1 running on a Windows 2008 R2 SP1. Im not seeing anything in the error logs right now. I also do not see it attempt to authenticate to the Domain Controllers either for the user that is in the Quota Managers group for a policy.