After upgrading haproxy, SSL clients cannot connect anymore with message ERR_SSL_PROTOCOL_ERROR

Solution Verified - Updated -

Issue

  • After upgrading haproxy, SSL clients cannot connect anymore with message ERR_SSL_PROTOCOL_ERROR
  • A SSL certificate working on haproxy 1.5.16 doesn't work on haproxy 1.8.23 with error message ERR_SSL_PROTOCOL_ERROR
  • After upgrading from RHEL7.4 to RHEL8.3 SSL sites in haproxy cannot be accessed anymore with error message ERR_SSL_PROTOCOL_ERROR

Environment

  • Red Hat Enterprise Linux 8
  • haproxy 1.8

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