[X2Go-User] How to Pass SSH Options From X2goclient?

[Jon Forrest]

On 4/28/2024 2:54 AM, Ulrich Sibiller wrote:

> Not directly, but libssh (partly) read your ssh config. So you can
> add a host stanza with the settings for your  destination host
> there.

Are you quite sure? With the following in my ssh config file

Host example.com
         PubkeyAcceptedAlgorithms +ssh-rsa
         HostKeyAlgorithms=+ssh-rsa

I can run ssh on the command line successfully but trying to start an x2go
session results in

kex error : no match for method server host key algo: server [ssh-rsa,ssh-dss], client [rsa-sha2-512,rsa-sh
a2-256,ssh-ed25519,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,sk-ssh-ed25519 at openssh.com,s
k-ecdsa-sha2-nistp256 at openssh.com]

Does x2go actually use the system ssh executable (e.g. /usr/bin/ssh)?
The reason I'm asking is because I did an experiment and renamed
ssh to xxx. I got the same result, shown above, when running the x2goclient!
This was a surprise.

Thanks,
Jon


> Jon Forrest <nobozo at gmail.com <mailto:nobozo at gmail.com>> schrieb am
> Sa., 27. Apr. 2024, 20:30:
> 
> Due to reasons too sad to describe, I need to X2go from a modern
> Fedora 40 system to a Ubuntu 10.04 (!) system.
> 
> Running ssh from the command line fails with the message
> 
> Unable to negotiate with XX.XX.XX.XX port 22: no matching host key
> type found. Their offer: ssh-rsa,ssh-dss
> 
> After some work I got this to work by adding
> 
> -oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedAlgorithms=+ssh-rsa
> 
> to the ssh command line.
> 
> My question is how can I add these options to the ssh command that
> X2go executes on the client?
> 
> Cordially, Jon Forrest 
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