I just ran into this irritating problem while trying to
ftp from my mac to my Ubuntu machine. The service kept returning a login incorrect error and I was literally banging the keyboard to make sure I am pressing the pwd keys correctly! :-(
Then I tried to
ssh with a copy n paste password and then the ssh worked just fine! But the CMD+V on the ftp command still didn't work!
After a bit of google research, I solve the problem as mentioned here.
I had to do a
sudo vi /etc/vsftpd.conf and change the
pam_service_name line to
pam_service_name=ftp (I think it was
sudo service vsftpd restart and the login worked just fine!