The following error occurred after upgrading to CTS 5.3. (The error has also been seen with upgrading to CTS 5.5.)
TSS6161E CA TSS CICS Initialization Incomplete RSN=11
The following matrix contains the compatibility fixes needed for the various releases of CICSs.
Top Secret for z/OS Compatibility
Make sure the Top Secret maintenance in the matrix is applied for the specific release of CICS. Also check the matrix for the compatibility maintenance required for the release of Common Services you are running.
Make sure KO50DCM2 is defined in the ENF parameter file.