java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 503 Service Unavailable

Solution Verified - Updated -

Issue

  • "java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 503 Service Unavailable" is found when calling remote site via https

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 6, 7

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