How to set ssh key exchange algorithm when using Publish Over SSH plugin?

[zil...@gmail.com]

I'm using the Publish Over SSH plugin t6o upload files to our SFTP site. I'm getting this error

ERROR: Exception when publishing, exception message [Failed to connect and initialize SSH connection. Message: [Failed to connect session for config [ftp.company.com]. Message [Algorithm negotiation fail: algorithmName="server_host_key" jschProposal="ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-512,rsa-sha2-256" serverProposal="ssh-rsa"]]]

In spite of me having this in C:\Users\myUser\.ssh\config

and in C:\Windows\system32\...\.ssh\config

Host ftp.company.com

User myUser

HostName ftp.company.com

HostKeyAlgorithms=+ssh-rsa

One explanation is the plugin doesn't use either config file. What am I missing? TIA

Chris

[Alex Earl]

You are correct, the plugin does not use either config file (or any config file for that matter). It looks like Jsch (the SSH library used) does not support ssh-rsa anymore. You would need to setup one of the other host key types (ssh-ed25519 would probably be best) on the server.

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[Dirk Heinrichs]

Am Donnerstag, dem 01.06.2023 um 10:44 -0700 schrieb Alex Earl:

You are correct, the plugin does not use either config file (or any config file for that matter). It looks like Jsch (the SSH library used) does not support ssh-rsa anymore. You would need to setup one of the other host key types (ssh-ed25519 would probably be best) on the server.

See also: https://issues.jenkins.io/browse/JENKINS-71273

Bye...

Dirk

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Dirk Heinrichs

Senior Systems Engineer, Delivery Pipeline

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