EMQ X 4.3.9 is released now, it mainly includes the following changes:

Bug fixes (Important):

• Fix the issue that calls between clusters may cause the client process to lose response

  Github PR: emqx#6062

• WebHook's HTTP client SSL configuration parse

  Github PR: emqx#5696

• MongoDB resources allow host names

  Github PR: emqx#6035

• Performance improvement for built-in database ACL (emqx_auth_mnesia)

  Github PR: emqx#5885

• Fix the issue that the authentication based on the built-in database incorrectly transcodes the HTTP request parameters

  Github PR: emqx#5674

• Fix the issue that resources cannot be released after the rule engine disables the rules in cluster

  Github PR: emqx#5731

• Fix some issues of STOMP gateway

  Github PR: emqx#6040

Bug fixes (Minor):

• Fixed the issue that the Client ID containing "\" characters could not be searched in a fuzzy manner

  Github PR: emqx#5978

• Fix the issue that variable byte integers may be larger than 4 bytes

  Github PR: emqx#5826

Enhancement:

• Improve client kick (forced step-down)

  Github PR: emqx#6030

• Add support for new cipher suites for LwM2M gateway

  Github PR: emqx#5970

• Introduced interleaving for priority queues (to avoid low priority queue stavation)

  Github PR: emqx#5666

• HTTP authentication plugin disable superuser requests by default

  Github PR: emqx#5567