Default certs suddenly stop working

I have Openfire 3.6.0 installed on my MacBook. The sole purpose is a book I am reading uses it for it’s examples (Growing Object-Oriented Software, Guided by Test - Steve Freeman & Nat Pryce).

After a break, I came back and could not connect. After taking the precaution of just restarting the machine for a fresh start, I still couldn’t connect.

After some investigation I found that the certificates were suddenly invalid (the were good till 2017). I am not sure what or how to get it working again. This is obviously new to me.

Java Version:
1.6.0_65 Apple Inc. – Java HotSpot™ 64-Bit Server VM
Host Name:
OS / Hardware:
Mac OS X / x86_64