Customize member MFAXML in the CNTL data set. These are the Mainframe Access server initialization parameters referenced by the Mainframe Access started task JCL and Mainframe Access Application Server started task JCL.
Change TCP_PORT="2020" to TCP_PORT="clientport". This is the port number that Micro Focus client software should be configured to use.
Change NETWORK_ID="DDINET1" to NETWORK_ID="netid", the VTAM SNA network id of your system.