zentol commented on pull request #18334:
URL: https://github.com/apache/flink/pull/18334#issuecomment-1010855565


   This is such a weird change. It only protects against concurrent uses of 
`NetUtils#getAvailablePort`, but any other port allocation can still break it.
   
   It also seems like we could solve this properly for at least a few cases; 
the NettyClientServerSslTest could be changed to use port 0 for the server, and 
then query the server for the actually used port and pass that to the client...


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