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When the SSL object was destroyed, it would invalidate all SSL_SESSION objects including the cached, but not yet used, TLS session objects. Properly disassociate the SSL object from the SSL_SESSION before we store it in the TLS session cache, so we can later destroy it without invalidating the cached TLS sessions. Co-authored-by: Ondřej Surý <ondrej@isc.org> Co-authored-by: Artem Boldariev <artem@isc.org> Co-authored-by: Aram Sargsyan <aram@isc.org>