After creating a new plex, you had all of your definitions in place, yet you continued to receive the message EYUCL0107E indicating the MAS name was not valid. The protocol ESSS is CICSPlex SM Environment Services System Services.
Missing the NAME in the EYUPARM.
You had defined the CICSSYS with a name in the "System Name ===>" field. You had not specified a NAME in the EYUPARM for the LMAS. If a name is not specified, the default for CICSPlex SM is to use the APPLID. This causes the INVALID MAS name condition to be raised.
System Name
Specify a 1- to 8-character name for the CICS system to be associated with the CICSplex identified as the context. The name can contain alphabetic, numeric, or national characters. However, the first character must be alphabetic.
Note: The name of a CICS system must be unique within the CICSplex; it should not be the same as the name of another CICS system, a CICS system group, or the CICSplex itself.
Make sure that the name you specify here matches the name you specify with the EYUPARM parameter NAME in the start up JCL for the CICS system. See CICSPlex SM system parameters for additional information.
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CICSPlex SM CICSPlexSM CPSM CP/SM