Opc ua connection

I can read and write in local network at Mendix(with Opc UA connector module in marketplace) with opc ua server,  until doing upload to version control server. but  when upload, view app in browser, i tried to connect with opc ua server(external ip). but i got the message.    Unable to connect because of error: Connection refused com.mendix.systemwideinterfaces.MendixRuntimeException: com.mendix.core.CoreException: java.util.concurrent.ExecutionException: UaException: status=Bad_ConnectionRejected, message=io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: / at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:108)   but  external Ip: port is  current Listening and remove firewall.  How to solve it 
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