"oversized record received" error in trial connection with OEM plugin

[jung huh]

Anyone experienced the same error during OEM plugin setup? Looks to me it is expecting HTTP, not TLS response. 

"ERROR [OEM2OpsGenie] Failed to post data from OEM. Post https://api.opsgenie.com/v1/json/oem: proxyconnect tcp: tls: oversized record received with length 20291"

Snippet from config file is as shown.

oem2opsgenie.http.proxy.enabled=true
oem2opsgenie.http.proxy.port=443
oem2opsgenie.http.proxy.host=<our proxy server>
oem2opsgenie.http.proxy.protocol=https

Thanks