chylek-qr commented on issue #351:
URL: https://github.com/apache/mina-sshd/issues/351#issuecomment-2798753586

   It's not resolved in 2.15.0. I redacted the username and domain names, but 
`.ssh/config` looks like this:
   
   ```
   Host example.proxy
           User username
           Hostname 192.168.123.123
           ProxyJump usern...@example.com
   ```
   
   The proxy jump gets parsed as `ssh://usern...@example.com`, and then 
https://github.com/apache/mina-sshd/blob/master/sshd-core/src/main/java/org/apache/sshd/client/SshClient.java#L723
 gets `-1` as the port, passes it into the jump `HostConfigEntry`, and it fails 
validation.
   
   ```
   java.lang.IllegalArgumentException: Invalid port: -1
        at 
org.apache.sshd.common.util.ValidateUtils.createFormattedException(ValidateUtils.java:234)
        at 
org.apache.sshd.common.util.ValidateUtils.throwIllegalArgumentException(ValidateUtils.java:200)
        at 
org.apache.sshd.common.util.ValidateUtils.checkTrue(ValidateUtils.java:183)
        at org.apache.sshd.client.SshClient.doConnect(SshClient.java:562)
        at org.apache.sshd.client.SshClient.doConnect(SshClient.java:574)
        at org.apache.sshd.client.SshClient.connect(SshClient.java:552)
        at 
org.apache.sshd.client.session.ClientSessionCreator.connect(ClientSessionCreator.java:199)
        at 
org.apache.sshd.client.session.ClientSessionCreator.connect(ClientSessionCreator.java:188)
   ```


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