[X2Go-User] bug 106 - SSH Host Key Validation fails when ECDSA is already known

[Pascal d'Hermilly]

On 24-04-2013 10:40, Anders Bruun Olsen wrote:
> For me, removing the key with 'ssh-keygen -R' works fine to make x2goclient stop complaining. When x2goclient adds a host-key for me, it adds to ~/.ssh/known_hosts.
Apparently I had added a ssh-proxy in order to debug before I did 'ssh-keygen -R' which meant I had to remove another key. thanks.

Anyway this bug is triggered by doing a ssh to the machine before using the x2goclient. Not an unnormal pattern.
Essentially this error is a false positive and hinting the user what needs to be done would be a good idea.

Pascal

> Have you made sure you removed all versions of the hostname? If your server is called server.domain.tld, be sure to remove both 'server' and 'server.domain.tld' with 'ssh-keygen -R'. Alternatively you can delete ~/.ssh/known_hosts, which will mean having to re-accept host-keys for all other hosts you normally ssh into.
>
>
> 2013/4/24 Pascal d'Hermilly <pascal at dhermilly.dk <mailto:pascal at dhermilly.dk>>
>
>     How do I remove the host key?
>
>     This bug is quite annoying. Especially because it's easy to trigger and the prompt dialog doesn't explaint how to remove the existing key.
>     http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=106
>
>     I already tried 'ssh-keygen -R [host]' with no effect. and according to the bug report this is not how it's done anymore...
>
>     Pascal
>
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> -- 
> Anders Bruun Olsen
> It-ansvarlig
> Det Danske Sprog- og Litteraturselskab
> (Society for Danish Language and Literature)

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