Use Enforce Mm (-enforceMm) to specify that the behavior of the Message Buffer Size (-Mm) startup parameter follow prior releases.

OpenEdge uses message buffers to move records (messages) between servers and remote clients. The size of the message buffer is specified with -Mm. Starting in OpenEdge Release 11.6, the value of -Mm is not required to agree between the server and the client, however in releases prior to OpenEdge 11.6, the value of -Mm had to be specified the same for both the client and the server or the connection is refused. Use Enforce Mm (-enforceMm) to require agreement between the client and server values of -Mm as in earlier releases.