URGENT Problem: The server requested authentication method unknown to the client

[TheMask]

#2054 - The server requested authentication method unknown to the client

when i want to connect phpmyadmin i see this error
and

when i want to connect websites
Database connection error (2): Could not connect to MySQL.Database connection error (2): Could not connect to MySQL.
server run good mysql started

what is myproblem?

 

[TheMask]

when i create new db all is fine no any problem

isee this problem when i want to install backups

 

[TheMask]

old_passwords=1 or 0

not working still same

 

[smtalk]

Please let us know the output of:

mysql --defaults-extra-file=/usr/local/directadmin/conf/my.cnf -e "SELECT User, Length(Password) FROM mysql.user WHERE Length(Password)=16;"