If you see this error message in your s2Member log files (i.e., in your s2-http-api-debug.log file), it indicates there was an HTTPS communication failure. This points to a larger issue that can lead to a lot of unexpected behavior. Therefore, it’s important to identify the underlying cause and get this fixed ASAP. SSL certificate problem: unable to get local issuer certificate. This actually occurs within the WP_Http class in the WordPress core. It occurs as a result of s2Member attempting t…