OpenShift requires that the client socket bind address be set to the OPENSHIFT_INTENRAL_IP loopback. ProtocolChannelClient currently does not support config for the bind address. connect(..) should be calling

return endpoint.connect("remote", bindAddress, destAddress, builder.getMap(), actualHandler, sslContext);

instead of

return endpoint.connect(uri, builder.getMap(), actualHandler, sslContext);

and expose bindAddress config