After upgrading to Jenkins 1.576, when attempting to login (we use active directory authentication), I get the following:
It's random, but I seem to always get it on the first login attempt at least. It doesn't matter if I check "Remember me on this computer" or not. I can try to login, get the above failure, quickly go back and hit "log in" again and I go straight in without the NPE.
I thought it was related to my upgrade to 1.576 since I did not notice this the day before. I don't see much on the system log page that could be related to this.
I am using the latest active directory plugin version.