Updated JFBConnect and thought I'd try Yahoo. It will not work no matter how many times and ops I've tried. It shows a 404 page with a message across it SSL error when trying to login with the Yahoo tab. It doesn't even ask for https:// for even the call back URL and only accepts domainname.com
SSL certificate problem: unable to get local issuer certificate
Ok Just figured it out
Disable SSL Certificate Validation" option in the JFBConnect > Configuration > General tab to Yes.
That setting is new for JFBConnect v6.3. We've seen issues with authentication for Amazon, Windows Live, and Yahoo and SSL for some server configurations. Glad that helped work around the problem.