Connecting with sftp to server who uses legacy ssh-dss

Help
1

I have been trying to connect to a server using sftp from Dolphin. I unfortunately get the following error message:

kex error : no match for method server host key algo: server [ssh-dss], client [ssh-ed25519,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256]

The problem might be that the server uses the legacy ssh-dss for connections, which is disabled by openSSH. But while with ssh you may add the flag

`-oHostKeyAlgorithms=+ssh-dss`

to enable it’s use again, yet I can’t find any option to do the same in Dolphin.
Is there any way to do this?

I’m on NixOS 24.05 with KDE Plasma 6.0.0 from the unstable branch.

2

sftp is provided by kio-extras that default compiles using the libssh, that deprecated ssh-dss algo a few years ago.

You might be able to add the option to your ~/.ssh/config file for the host.

Host somehost.example.org
	KexAlgorithms +diffie-hellman-group1-sha1

Ref: