问题
When i try to connect a remote mysql server from my localhost i get this error:
Could not connect: mysqlnd cannot connect to MySQL 4.1+ using the old insecure
authentication. Please use an administration tool to reset your password with
the command SET PASSWORD = PASSWORD('your_existing_password').
This will store a new, and more
secure, hash value in mysql.user. If this user is used in other scripts executed
by PHP 5.2 or earlier you might need to remove the old-passwords flag from
your my.cnf file
Any idea why it gives this error?
回答1:
It gives this error because your MySQL server uses the old way of storing password -- and not the new way, which is more secure.
The mysqlnd driver, which has been introduced with PHP 5.3, doesn't support the old authentication way.
So, you have to modify your MySQL configuration, to use the new, more secure way.
The error message you get is indicating you how to do that.
回答2:
this helped me
http://www.phpro.org/articles/Database-Connection-Failed-Mysqlnd-Cannot-Connect-To-MySQL.html
quick fix
as db user
SET SESSION old_passwords=0;
SET PASSWORD=PASSWORD('my_password');
as admin
FLUSH PRIVILEGES;
real fix
open up your my.conf file and comment out the following line
old_passwords=1
Restart MySQL. this will ensure MySQL never uses the old passwords again.
as db user
SET PASSWORD=PASSWORD('my_password');
as admin
FLUSH PRIVILEGES;
回答3:
It seems to be an issue when running PHP <=5.2 code in PHP 5.3+: http://forums.mysql.com/read.php?52,403493,411125#msg-411125
来源：https://stackoverflow.com/questions/5687087/mysql-password-error-in-php