Warning: mysql_connect(): The server requested authentication method unknown to the client [mysql_old_password] in /home/catalogodealiancas/www/classes/class.conexao.php on line 50

Warning: mysql_connect(): The server requested authentication method unknown to the client in /home/catalogodealiancas/www/classes/class.conexao.php on line 50

Não foi possível conectar-se ao servidor MySQL.
Erro MySQL: The server requested authentication method unknown to the client