nicoloboschi opened a new issue #13705:
URL: https://github.com/apache/pulsar/issues/13705


   `EndpointIdentificationAlgorithm` parameter must be set to "HTTPS" to 
properly perform hostname validation during `SslEngine` creation.
   As far as I can see in the Pulsar codebase this parameter is left to the 
default value; this means that the hostname validation is disabled.
   
   More context here
   * https://github.com/netty/netty/issues/9930
   * https://github.com/netty/netty/issues/8537
   * 
https://docs.oracle.com/javase/8/docs/api/javax/net/ssl/SSLParameters.html#setEndpointIdentificationAlgorithm-java.lang.String-
   * 
https://netty.io/4.1/api/io/netty/handler/ssl/SslContext.html#newHandler-io.netty.buffer.ByteBufAllocator-java.util.concurrent.Executor-
  


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