Unable to connect Splunk HEC using https

Hi I'm trying to push logs to Splunk using Splunk HTTP appender in Log4j. If I disable SSL in HTTP event Collector Global Settings, I can push the logs to Splunk successfully whereas if I enable SSL, I cannot see any logs. Is there some configuration missing as part of my log4j ? Please help. mule:log.splunk.url : http://localhost:8088 --> disabling SSL mule:log.splunk.url : https://localhost:8088 --> enabling SSL