TLS handshake fails without PSK extension

Expected behaviour

A client successfully connects to a TLS enabled listener using TLS 1.3

Observed behaviour

The connection attempt is rejected by the broker with the following ERROR

Reason

This is a known issue in some OpenJDK versions and has been fixed in OpenJDK 11.0.2
Since HiveMQ defaults to TLS 1.3 starting with HiveMQ 4.5.0, some clients which previously
connected using TLS 1.2 may start seeing this.

Solution / Workaround

This behaviour can be mitigated by upgrading to OpenJDK 11.0.2 or higher. Alternatively,

if Java cannot be upgraded it is possible to specify TLS version 1.2 in HiveMQ’s configuration.

Affected Version

OpenJDK < 11.0.2