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From "Zhenliang Su (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SSHD-930) Send the client version string after receiving the version string of the server
Date Wed, 03 Jul 2019 02:45:00 GMT
Zhenliang Su created SSHD-930:
---------------------------------

             Summary: Send the client version string after receiving the version string of
the server
                 Key: SSHD-930
                 URL: https://issues.apache.org/jira/browse/SSHD-930
             Project: MINA SSHD
          Issue Type: Improvement
    Affects Versions: 2.2.0
            Reporter: Zhenliang Su


The rfc4253 does not indicate whether the ssh client must send its own version number right
after receiving the version number of the server.
I have encountered a situation where mina-sshd is used to connect to cisco's sshd service,
sometimes it can be connected, sometimes not connected.
Some rules are found by capturing packets. If the client sends its own version number after
receiving the version number of the server, it can be connected. If the client sends its own
version number before receiving the version number of the server, then it will not be connected.
I think, a better way is to change the SshClient code to send the version number of the client
right after receiving the version number of the server.



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