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

CALLNAT ‘USR2007N’ ‘P’ #BROKER #SERVER #LOGON #PROTOC
CALLNAT ‘SENDFREI’ #IN-APPLIC-CODE(AD=O) #IN-CNTRL-ACCESS-KEY(AD=O)
#OUT-APP-CODE(AD=A)

It is failing at the call to SENDFREI.

The description for reason 9 indicates

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