can not push kinesis stream to splunk enterprise 7 with errorcode sslhandshake error? how to fix it ?

[yousheng]

I noticed the following error in cloudwatch console,
{ "deliveryStreamARN": "arn:aws:firehose:us-east-1:150563084062:deliverystream/firehosesplunkdeliverystream", "destination": "https://ec2-54-196-148-73.compute-1.amazonaws.com:8088", "deliveryStreamVersionId": 14, "message": "Could not connect to the HEC endpoint. Make sure that the certificate and the host are valid.", "errorCode": "Splunk.SSLHandshake", "processor": "arn:aws:lambda:us-east-1:150563084062:function:firehosesplunktransformvpc:$LATEST" }

I guess this is a ssl-related certificate issue, but I don't know how to fix it ?

thanks in advanced