tmds opened a new issue, #664:
URL: https://github.com/apache/mina-sshd/issues/664

   ### Version
   
   2.11.0
   
   ### Bug description
   
   When the client and server agree on an AEAD ciper (like 
`[email protected]`or `[email protected]` the server 
disconnects when the client and server have no common MAC algorithm.
   
   ### Actual behavior
   
   The server disconnects when there is no common algorithm MAC algorithm 
between the client and server.
   
   ### Expected behavior
   
   With an AEAD cipher, no separate MAC algorithm is needed, so the server 
should not require a common MAC algorithm. The key exchange should continue.
   
   ### Relevant log output
   
   ```Shell
   Unable to negotiate key exchange for mac algorithms (client to server) 
(client:  / server: 
[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1)
   ```
   
   ### Other information
   
   Reported by @pandabytes when using Tmds.Ssh .NET client in 
https://github.com/tmds/Tmds.Ssh/issues/356.


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