wumengchao commented on issue #587:
URL: https://github.com/apache/mina-sshd/issues/587#issuecomment-2317144924

   The process is quite complex, so I'll describe it in words. Let's assume: 
Client IP: 10.0.0.1, Server IP: 192.168.0.1. The client establishes a local 
port mapping from port 22 to remote port 1111 using jsch. By accessing 
127.0.0.1:1111 from the server (192.168.0.1), we can access the client's SSH. 
Then, on the server, we use jsch to create a local port mapping from server 
port 2222 to the client's port 3333. Accessing 127.0.0.1:2222 on the server 
would reach port 3333 on the client, at which point an exception will be 
reported.


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