SSL Error

Have you tried this step:

Set 'Disable SSL Certificate Validation' to Yes in the JFBConnect Configuration

Generally, the error you're getting means that your server doesn't have the most up-to-date root certificates to verify that the SSL certificate returned from Facebook.com is authentic. The setting mentioned can skip that check, but the best solution is to contact your hosting provider to ensure that the root certificates on your server are up to date.

Thanks,
Alex

Again, we already have a setting to disable the SSL check. Please set 'Disable SSL Certificate Validation' to Yes in the JFBConnect Configuration area. I'm not sure how you load the root certificates into a Windows server to be used properly by PHP. I believe there's a separate place that you need to configure PHP and cURL to use them. I wouldn't have any better answers on Linux either though since each flavor has different ways to do things.

JomSocial does things differently and, I believe, they disable the SSL check by default. That really should only be done if necessary, like in your case.

I hope that helps,
Alex