Today I changed my VPN password. First, I wish NM automatically noticed that my old password was invalid. Meanwhile, I used seahorse to delete my old VPN passwords. Then I tried to connect to the VPN. NM seemed to try the old password. I was surprised to find that there was any caching going on. Also, I expected NM to notice that my passwords had been removed, and to ask me to enter new ones. Restarting NM worked around the problem.
Probably dupe of bug #429287 ?
*** This bug has been marked as a duplicate of bug 448946 ***