SSH not working

[IgorM]

I've configured ssh on a debian sbc and it works with every client computer connect to. Now I've installed openssh on a computer running lubuntu and the first client I tried to connect it worked but after trying to connect another computer to it an error message shows up: 

Quote

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is

What do I have to do to have to only enter the password to connect to the server?

[kompetenzbolzen]

remove the corresponding entry in ~/.ssh/known_hosts on the lubuntu machine

This error indicates that the server certificate has changed since the last time you connected (probably due to a reinstall)

[IgorM]

3 hours ago, kompetenzbolzen said:

remove the corresponding entry in ~/.ssh/known_hosts on the lubuntu machine

This error indicates that the server certificate has changed since the last time you connected (probably due to a reinstall)

I saw other people mention this but the folder doesn't exist here

[kompetenzbolzen]

files and folders starting with a dot are hidden by default. Try Ctrl+H if in GUI or just cd .ssh if you're in the terminal

[IgorM]

3 hours ago, kompetenzbolzen said:

files and folders starting with a dot are hidden by default. Try Ctrl+H if in GUI or just cd .ssh if you're in the terminal

I'm using the terminal and there isn't such folder

[kompetenzbolzen]

known_hosts is a textfile.

If you can't find /home/<user>/.ssh , you either are not logged in as the user using the ssh-client( sudo? ) or it is configured to put its stuff elsewhere

[IgorM]

12 minutes ago, kompetenzbolzen said:

known_hosts is a textfile.

 

yeah I know

 

12 minutes ago, kompetenzbolzen said:

If you can't find /home/<user>/.ssh , you either are not logged in as the user using the ssh-client( sudo? ) or it is configured to put its stuff elsewhere

both root and default users don't have this folder. Where it could be? 

[IgorM]

@kompetenzbolzen running 

ssh-keygen -R SERVERIPADDRESS ont the client seemed to solve the issue

 

[kompetenzbolzen]

yeah makes sense... this basically does what i told you to do automatically. I'm kind of ashamed i didn't think of that...