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Well, I'm working with virtual machines and I was trying to establish connection between client and server by ssh (from client to server). I installed ssh in both machine and I restarted too. It was not a problem. But, when I tried to connect from client with:

ssh -p 22 myservername@myserverip

It said: "Host key verification failed". It's always the same, whatever I've done.

This is the second time I've tried it (I uninstalled the two ubuntus and installed again)

What could I do to establish that connection?

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When you reinstall a machine it gets a new ssh host key, but the old one is still stored in your key file.

Open ~/.ssh/known_hosts with an editor and remove the lines containing the problematic host keys.

You'll be asked to verify the new host keys the next time you connect.

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