Call from Mainframe to EntireX

when i try to call enitireX from mainframe i am getting the following error.

NAT6971 Connnection error on Client, reason 9, XMLSERVERUS.

The server is XMLSERVERUS.

The code is


It is failing at the call to SENDFREI.

The description for reason 9 indicates

Can you try this to find out what’s up ?