So, i\'ve been having this problem for a while now.
Notepad++ NppFTP plugin fails to connect to server via SFTP with \"[SFTP] Error during authentication: Invalid p
Log-in to your terminal. Make sure you are in /home/your_user_name/
First client private/public key
$ ssh-keygen -t rsa
Now add your public rsa key details to authorized keys, use the following command
$ cat id_rsa.pub >> ~/.ssh/authorized_keys
$ chmod 600 ~/.ssh/authorized_keys
After this delete the id_rsa.pub file if you wish.
Now the private key file id_rsa is the one you need to 'import
'.
You need the tool called the puttygen
to import this file and then
click on the Menu Bar
-> Conversions
-> Export OpenSSH Key
and save the exported file.
Save it as npp.ppk
(maybe) and then use this in the Notepad++ Private key file path.