I suspect there is a bug involved in the SSL client verification type changing and the re-negotiation flow. While I admit it may be a corner case but the original use case is very crucial to my current user base. I checked the Bug database and there is a similar bug except that is related to TLSv1.3. For browser compatibility, I am currently disabling TLSv1.3, although I am testing with Apache 2.4.38 and OpenSSL 1.1.1b.I would love to hear any suggestions on an alternative configuration to support my scenario, and thank you very much in advance.