Hello i'm not sure if you may have the same problem i had before with System Manager 3.0 but i also closed the the Browser and after that there was no login possible anymore. The problem was easy to fix but took me an hour to finde the answer. I had to enable http on the console, i don't know why but it was turned off somehow. 5 minutes before i was connected via System Manager and did not change any options. Maybe you have the same problem.
PS: Sorry, didn't see that it worked after you tried it 3rd time, so my answer will not be helpful.