Reviewing posts pertaining to SECURE CONNECTION FAILED and error code related to that message, one of the suggestions found on-line is to delete any listing from the Certificate Manager that is/may be a problem. However, NONE of those suggestions or discussions makes any mention about "how does one determine which listings those are?" Relative novice here; was considering whether the "solution" was to merely delete all of the certificate listings, with the hope that the system would then repopulate what was necessary as time went on; some on-line information seems to indicate that to be not a good course of action . . . so my course of action has been to do nothing. Question remains: how does one determine which listings can be deleted? Thanks for any clarification.