Failure authenticating with password protected ed25519 private key

[cyberduck]

kinglok created the issue

Cyberduck can log myself through SFTP protocol with using ed25519 private key. However, if a ed25519 key is password-protected, Cyberduck cannot login the same server but showing the following error message:

Exhausted available authentication methods. Please contact your web hosting service provider for assistance.

---

Attachments

• 2020-08-11 - sshd debug3 auth log output.txt (16.7 KiB)
• debug.log (48.0 KiB)
• sshd_debug.txt (5.1 KiB)

[cyberduck]

@dkocher commented

Please update to the latest snapshot build available which should resolve this issue.

[cyberduck]

kinglok commented

I am sorry to tell the problem still exist in version 6.3.0 (26995)

[cyberduck]

63c2648 commented

Hi, Are you planning to apply this to the stable version (Mac App Store version)? Thanks.

[cyberduck]

@dkocher commented

In 4de7b08.

[cyberduck]

63c2648 commented

Hi,
Updated the App (via App Store) and unfortunately, it still not working. Getting the following error: "Exhausted available authentication methods. Unknown key type ssh-ed25519. Please contact your web hosting service provider for assistance."
However, it seems working fine with the nightly builds.
Thanks.

[cyberduck]

@dkocher commented

Are you running version 6.6.2 (28219) from the Mac App Store?

[cyberduck]

63c2648 commented

Replying to [comment:8 dkocher]:

Are you running version 6.6.2 (28219) from the Mac App Store?
Correct

[cyberduck]

@dkocher commented

Replying to [comment:9 UniverseX]:

Replying to [comment:8 dkocher]:

Are you running version 6.6.2 (28219) from the Mac App Store?
Correct
I am unable to reproduce with a key generated using ssh-keygen -t ed25519 running 6.6.2 (28219).

[cyberduck]

63c2648 commented

Replying to [comment:10 dkocher]:

Replying to [comment:9 UniverseX]:

Replying to [comment:8 dkocher]:

Are you running version 6.6.2 (28219) from the Mac App Store?
Correct
I am unable to reproduce with a key generated using ssh-keygen -t ed25519 running 6.6.2 (28219).
I’ve generated it in Putty (Windows).

[cyberduck]

63c2648 commented

Replying to [comment:13 dkocher]:
Then how you explain that it works fine in nightly built?
The key is working fine in other Windows/macOS applications (e.g. Yummy FTP Pro, Putty etc.)

[cyberduck]

63c2648 commented

I have recreated a key via macOS terminal and can confirm that it’s working now. It seems that there is an issue with Putty keys. Thanks.

[cyberduck]

@dkocher commented

Can you please try re-selecting the PuTTY private key in the bookmark settings and try to connect again.

[cyberduck]

63c2648 commented

Replying to [comment:18 dkocher]:

Can you please try re-selecting the PuTTY private key in the bookmark settings and try to connect again.
I've tried all possible scenarios - reinstalling the app, re-creating bookmarks, re-choosing the key, however, unfortunately, it's still not working. Gonna stick to the newly created key (via ssh-keygen), was able to convert the new key to the Putty format using puttygen nightly build.
Thanks.

[cyberduck]

kinglok commented

Hi,

I use the following the command to create the private/public key pair for logging my Debian server.

ssh-keygen -t ed25519 -f ssh_host_ed25519_key

While using the latest snapshot of Cyberduck and come across with “Application error”.

please advise how I can help by fixing it up.

Thanks,

Kinglok, Fong

[cyberduck]

@dkocher commented

Can you please attach the screenshot of the failure message and any related output in the system.log(/Applications/Utilities/Console.app).