Upgrading Openfire 3.6.4 to 3.7.1 Redhat Ent. Rel 4

Greetings all, I just joined a company and was tasked into upgrading the Corp IM running on Redhat from ver 3.6.4 to 3.7.1. I reviewed the upgrade install and it all “seems” quite simple. I ran the upgrade, on a test virtual machine, and after a few seconds it was done. I restarted Openfire but when I tried to login to the Admin console on port 9090, it gave me this error “The connection was reset” - “The connection to the server was reset while the page was loading.” Prior to upgrading, I did quite a bit of research and weren’t able to locate much to help me.

What am I missing. I wanted to share that I am not well verse in Linux. Any guidance is greatly appreciated.