machine add fails after SSH MFA on 0.9.0

[zxdvd]

Is this a reproducible bug?

• I confirm this is a reproducible bug, not a feature request, idea, question, contribution proposal, or direction check.
• I reproduced this bug on the version and environment reported below using the exact steps provided.

Current behavior

herdr --remote jms-dev works with my JumpServer MFA setup. But machine add asks for an OTP, then fails after I enter a valid code:

error: lost connection to server: server closed connection; machine was not saved

This happened on repeated attempts. The remote Herdr server was already running and reported compatible.

Expected behavior

Adding the same host should work after entering a valid MFA code.

Reproduction

1. Use a JumpServer SSH alias requiring a public key followed by keyboard-interactive TOTP. Leave Herdr's SSH settings at their defaults, with no shared ControlPath in SSH config.
2. Run herdr --remote jms-dev and verify that it connects, then detach.
3. Run herdr machine add jms-dev --label jms-dev and enter the current OTP. It fails with the error above.

Impact

I can use remote attach, but can't add this host to the multi-machine view.

Environment

• Herdr version: 0.9.0 locally and remotely (unmodified release)
• Update channel (stable or preview): stable
• Operating system: macOS 15.5 arm64; remote Linux
• Terminal: Ghostty
• Shell, if relevant: zsh locally
• Relevant config, if any: PreferredAuthentications publickey,keyboard-interactive, KbdInteractiveAuthentication yes, IdentitiesOnly yes

[aureliolapa]

I was having the same issue, than I read the docs:

If authentication fails, check ordinary SSH first. For a passphrase-protected key, load it with ssh-add before starting Herdr’s non-interactive background connections.

Then I run ssh-copy-id so the destination has the key of the source. And now is working