Connection refused

Each RSE connection starts several processes which are permanently active. New connections can be refused due to the limit set in SYS1.PARMLIB(BPXPRMxx) on the amount of processes, especially when users share the same UID (such as when using the default OMVS segment).

• The limit per UID is set by the MAXPROCUSER keyword and has a default value of 25.
• The system-wide limit is set by the MAXPROCSYS keyword and has a default value of 200.

Another source of refused connections is the limit on the amount of active z/OS® address spaces and z/OS UNIX users.

• The maximum amount of Address Space IDs (ASID) is defined in SYS1.PARMLIB(IEASYSxx) with the MAXUSER keyword, and has a default value of 255.
• The maximum amount of z/OS UNIX user IDs (UID) is defined in SYS1.PARMLIB(BPXPRMxx) with the MAXUIDS keyword, and has a default value of 200.