Claude Code requires ProxyCommand instead of ProxyJump for SSH connections through jump hosts

[angelopaolosg]

Description

When an SSH host in ~/.ssh/config uses ProxyJump, Claude Code fails to execute remote commands (e.g. rsync, ssh) through that host. Switching to the equivalent ProxyCommand fixes the issue. The same ProxyJump config works fine from the terminal.

SSH config (failing)
```
Host target-host
HostName
ProxyJump jump-host
```

Error
```
channel 0: open failed: connect failed: No route to host
stdio forwarding failed
Connection closed by UNKNOWN port 65535
rsync: error: unexpected end of file
```

Workaround

Replacing ProxyJump with ProxyCommand resolves the issue:

```
Host target-host
HostName
ProxyCommand ssh -W %h:%p jump-host
```

Expected behavior

Claude Code should handle ProxyJump the same way the system SSH client does.

Environment

• Platform: macOS
• Shell: zsh

[github-actions]

Found 1 possible duplicate issue:

1. [BUG] ssh ProxyCommand not working on claude desktop code tab on windows, ProxyJump not supported on windows or Mac #40967

This issue will be automatically closed as a duplicate in 3 days.

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🤖 Generated with Claude Code

[github-actions]

This issue has been automatically closed as a duplicate of #40967.

If this is incorrect, please re-open this issue or create a new one.

🤖 Generated with Claude Code

[github-actions]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.