Why can't I connect to the SSH server?

Question

linux

I generate a key:
sudo ssh-keygen
And the key is stored in ~/key.pub
Then I try to copy this key to the server and I get an error:

/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
Permission denied (publickey).

Answer 1

try manually copy cat ~/.ssh/id_rsa.pub
create folder

mkdir .ssh
chmod 700 .ssh

and paste the key into the filenano .ssh/authorized_keys

Answer 2

password access is disabled, how are you going to upload the key via ssh if there is no access?
you need to create a .ssh directory in the home directory of the user you plan to login as, and copy the contents of the id_rsa.pub file generated by ssh-keygen into the authorized_keys file. make sure that the ssh server config contains the following line:
AuthorizedKeysFile %h/.ssh/authorized_keys
if not, add and restart the daemon

Answer 3

Most likely, fail2ban worked, you have to wait 20 minutes and try again (this time specifying the correct password)