Using DevTest Portal, able to successfully record TCP messages without SSL but when enabled 2way SSL (TLS1.2) and click on "Start Recording" get the error "undefined.Please choose a different port" as in the below screenshot. SSL certificate validates successfully.
Release : 10.5
Component : CA Service Virtualization
If anyone facing this issue, please open a support case and refer DE473111 and request a patch for DevTest 10.5