FS#34079 - x2goclient/x2goserver: Print message about problems with ecdsa hosts in ~/.ssh/known_hosts, etc.

Attached to Project: Arch Linux
Opened by Clemmitt Sigler (cmsigler) - Thursday, 28 February 2013, 22:25 GMT
Last edited by Andreas Radke (AndyRTR) - Friday, 01 March 2013, 05:26 GMT
Task Type Feature Request
Category Packages: Extra
Status Closed
Assigned To No-one
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No



I got x2goclient/x2goserver working OK, but had an error related to ssh that I had to find a solution to by Googling.

Connecting via ecdsa encryption doesn't work (if I understand correctly). To fix the problem, on the server the three "HostKey" lines for protocol version 2 need to be uncommented, then sshd should be restarted. On the client, one must manually remove from ~/.ssh/known_hosts any "ecdsa-sha2-nistp256" lines for connecting to the server before connecting through x2goclient. Doing these things allows a connection to be made. (Afterwards, I have an "ssh-rsa" line in my known_hosts file and both x2go and ssh connect properly.)

Please see this thread on the x2go-user mailing list:


My feature request is to print a short message about these two problems -- assuming they affect other users, too -- or include something in a README file under /usr/share/doc

Additional info:


Steps to reproduce:

1.) Install x2goserver and x2goclient
2.) Use ssh to connect to server, leaving an "ecdsa-sha2-nistp256" line in the ~/.ssh/known_hosts file.
3.) Connect using x2goclient. Error message: "The host key for this server was not found but an othertype of key exists.An attacker might change the default server key toconfuse your client into thinking the key does not exist."

HTH, thanks.

This task depends upon

Closed by  Andreas Radke (AndyRTR)
Friday, 01 March 2013, 05:26 GMT
Reason for closing:  Won't implement
Comment by Andreas Radke (AndyRTR) - Friday, 01 March 2013, 05:25 GMT
Such special use hints should go into our Wiki. Feel free to add them there. That's nothing to flood your install logs most users won't have to care about.