Resolution:
In addition to turning ON tracing, please enable the following properties by manually editing &ltBC>/bin/BCMiscProperties.cfg or using the opentoolbox/Property Editor tool:

  - bc.ssldebug    (this property controls client ssl debug printing);
  - SSL.Debug     (this property controls the server side ssl debug printing);
  - Config.SSLDebug     (this property is used by IM for its own client ssl debugging).

This SSL detailed tracing will allow you to review the several steps achieved during the SSL session creation/resumption.


Note: SSL Client tracing requires the minimum level of BC 3.5.0 Hotfix 5.