Changing the SSL version that is used for making outbound requests is becoming more common as versions are being deprecated. If using one of the older versions, you will get the Received Fatal Alert: Protocol_Version error.

Changing the version with JVM parameters is possible, but the easy way to change it is through the WAS administration console.

SSL certificate and key management > SSL configurations > NodeDefaultSSLSettings > Quality of protection (QoP) settings

Select TLSv1.1 for the Protocol.
ssl version