BIG-IP v12.1.2 (Build 1.0.271)
One of the new features is to automatically log SSL Handshake Failures, which sounded great.
When I tested it this was the entry made in /var/log/ltm:
Jul 31 08...
I had the same issue a while back and Support recommended changing my logging level to stop logging that message and said it was informational only and could be ignored otherwise.