Question
Can't login to my server with my SSH key
- Posted on April 18, 2020
- SecurityInitial Server Setup
Asked by reyesjmf
I created a new droplet and set it to use the usual SSH key on my account that I generated a long time ago with PuttyGen on Windows. I’m on a Mac now so I just copied over the PPK file thinking that I could use it to login. Turns out I can’t. I tried changing the permission of the file using chmod 600 but that didnt work. I went back to my Windows machine and used PuttyGen to convert the .ppk to an open ssh one. Same filename but with a .pem extension. I still can’t login to my server. Im geetting this:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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 [a long string of letters and numbers]
Please contact your system administrator.
Add correct host key in /Users/me/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/me/.ssh/known_hosts:1
ECDSA host key for IPADDRESS has changed and you have requested strict checking.
Host key verification failed.
Anybody?
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Hi there @reyesjmf,
You could try using the
ssh-keygencommand to delete the invalid key from yourknown_hostsfile. The command that you need to use would be:Let me know how it goes! Regards, Bobby
@bobbyiliev It worked like a charm! I ran your command and tried to connect with:
I got an error that my file wasn’t accessible and got “Warning: Permanently added ‘IPADDRESS’ (ECDSA) to the list of known hosts. Permission denied”
I tried again by adding the file path this way:
This time I was able to login.
Thanks for the help!