Problem with this website's security certificate

I was recently tasked with adding Web Chat to our website. When I use any browser other than FireFox I get a Security Certificate Error, stating "

*You attempted to reach, but instead you actually reached a server identifying itself as XYZ." *Can this be resolve from the Openfire Admin Console, if so, how? Or, is this a ‘server admin’ problem that needs to be resolve by the server administrator, if so, how? Or, does a new security certificate ‘need’ to be purchased. I’d really appreciate any help or suggestions to resolve this issue.