For a client we use SSL certificate authentication with Solr through the SOLR_SSL_NEED_CLIENT_AUTH=true setting. The client must then prove through a local pem file that it has the correct client certificate.
This works well until Solr 8.1.1, but fails with Solr 8.2 and also 8.3.1. There has been a Jetty upgrade from from jetty-9.4.14 to jetty-9.4.19 and I see some deprecation warnings in the log of 8.3.1:
I have made a simple reproduction script using Docker to reproduce first the 8.1.1 behaviour that succeeds, then 8.3.1 which fails: