Is Output Management Web Viewer 12.1 is compatible with z/OS 2.3?
Release : 12.1
Component : CA OUTPUT MANAGEMENT WEB VIEWER FOR ALL PLATFORMS
CCS Tomcat falls under CA Common Services for z/OS Compatibility
https://support.ca.com/phpdocs/0/MSPSaccount/COMPAT/AW0.HTML
There are no specific PTF's listed for Tomcat for z/OS 2.3.
Web Viewer can run on either USS or z/Linux on the mainframe and there are no required PTFs for z/OS 2.3.