Port issue with splunkd SSL

Hello, We want to enable Splunkd SSL, so we put enableSplunkdSSL = true to server.conf. We generated a certificate using the FQDN as the CN of the certificate. Then in our AddOn, we use splunk.getLocalServerInfo() to get the url:port. The problem is that splunk.getLocalServerInfo() always returns https://127.0.0.1:8089, even if we changed MgmtHostPort in web.conf. As a result, we always get an error: SSLError: hostname '127.0.0.1' doesn't match xxxxxx, where xxxxxx is the CN we set for the certificate. So how shall this work? Shall we use 127.0.0.1 as the CN to create a cert? Or we shall not call getLocalServerInfo()? Thanks!