Due to repeated failed login attempts via SSH a user account may get locked out. The following provides steps on how to reset the account.
If this is the only account you have access via SSH you may need to open the VM console via ESXi/vCenter:
Displaying the number of failed attempts:
pam_tally2 -u username
Reset the account:
pam_tally2 -u mystic –reset
Sucessfull login attempt: