PORT number requirement

A port number must be specified on the EXEC PARM of each remote Master job. The remote connection server listens for connections through this port and also the next higher (n+1).

For an example of remote master job, see the example in Remote master JCL. The port number in the REMOTE control statement in the Local TDMF session must match the port number that is specified in the Remote Master JCL. Where the size of a TCP/IP migration necessitates multiple concurrent TDMF sessions, each session consists of a Local Master and Agents and a corresponding Remote Master job. Each of these sessions must use a unique pair of port numbers.

Note: TDMF uses two ports for communications. Only one port number is specified. TDMF then uses that port number plus the next sequential port number. For example, if PORT=(8888) is specified, then TDMF uses port 8888 and 8889. The initial port number is used to communicate migration status while the second port number is used to migrate data.

Important: If the TCP/IP connection is lost, TDMF initially closes all the socket connects, then reestablishes communications on the second port, or PORT=(nnnn)+1. When the session is active again, using a single port, the TDMF TSO Monitor at the Remote system is NOT able to display up-to-date volume migration status.