SSH failed to connect my Kali through guacamole. Reading up, I found this article from 3rd May 2022 on reddit.
“Knowing very little about any of this, but it seems like Guacamole only supports ssh-dss and ssh-rsa, and both have been disabled in Ubuntu.
-UniqueCSX
DSS was removed 8 years ago and it seems from my quick google that RSA has been deprecated, so hopefully Guacamole updates sometime soon.
In the meantime a workaround is adding “HostKeyAlgorithms +ssh-rsa” to the end of /etc/ssh/sshd_config on the Ubuntu machine and restart sshd. Note: I don’t have an understanding of the security implications of this, so use at your own risk”
This involves editing sshd_config
sudo nano /etc/ssh/sshd_config
Then adding
HostKeyAlgorithms +ssh-rsa
[ctrl] + [x] to exit, [y] to overwrite, [enter] to confirm
Use at your own risk, hopefully by the time you read this the roundabout way wont be needed.
😀