Connect failed with error error
Review the error information, check that the connection parameters are correct, and try to connect again. See Connecting to a system from the Host Connections view for more information.
If you are connecting to a CICS system, and specifically to a CICS® TS v4 system, and the connection failed with the error NOTAVAILABLE CPSMAPI, it might be that you have not included the SEYUAUTH and SEYULOAD libraries in the STEPLIB & DFHRPL JCL respectively, or if you are connecting to a stand-alone (SMSS) CICS Region, there is an inconsistency in the version levels of the libraries. See Setting up the CICS management client interface for more information.
If you are connecting to a CICS TS for VSE/ESA 1.1.1 system, check that the DEFINE PROGRAM, DEFINE TRANSACTION, and DEFINE DOCTEMPLATE for CICS TS are correct.