It started a week ago. My coworker complained that he can't connect to Admin Console. Firefox throws an error that Connection was reset by a server. Non SSL 9090 port works fine, also SSL port works in IE9. At that moment it worked fine in my Firefox and worked till today. Today i'm facing same connection resets. Wonder if someone else experience this. I have upgraded 3.8.2 to 3.9.1 somewhere between it first occured and when it occured to me. So it is not 3.9.1 issue.
Certificates were regenerated maybe a month or so ago. Maybe it is related. Will try to remove and generate them again (self-signed ones, generated by Openfire).
Or maybe something changed in Firefox. Can't say what version was in use a week ago by my coworker. I'm now on 27.0.1, but it was released just a few days ago, so he couldn't already had 27.0.1. Most probably he was with 27.0.