mysqlnd：无法连接MySQL 5.5.24，old_passwords为Off

Question

I have two enviroments:

• Dev: Windows 7, PHP 5.3.24, Apache 2.2.24
• Production: Linux, PHP 5.4.10, Apache

Both connects to a remote MySQL 5.5.24 Server. Remote connections are allowed.

I replaced all mysql functions to mysqli. In production it connects OK, but in dev throughs the following errors:

Premature end of data (mysqlnd_wireprotocol.c:553)
OK packet 1 bytes shorter than expected
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

The weird thing that the MySQL is 5.5.24, not 4.1, and old_passwords is set Off. I even changed user's password (from hosting panel, I have no admin privileges to do it in MySQL itself).

I even tried with a newer version of PHP (5.4.15), and the problem persists.

All references I read points to outdated MySQL Server (not this case), old_password issue (again not this case because it connects OK on production).

UPDATE:

Old mysql functions don't work neither. Before changing mysql to mysqli, I was using PHP 5.2.* version, and it worked. So I'm almost sure that the problem has to do with bundled mysqlnd.

Answer 1

If you have MySQLND there is no way to authenticate using old_passwords under no circumstances. That is the drawback of MySQLND and probably the main reason why it was not adopted and will not be adopted for a long time by mainstream and especially shared hosting companies.

Sorry.

Just in case you wonder why this is: The old style password is considered highly insecure so support for it was removed to force people to update their password if they want the benefits of mysqlnd.

Fix: Update your password.

SET old_passwords=FALSE;
SET PASSWORD FOR 'User'@'Host'=PASSWORD('yourpassword');
FLUSH Privileges

You should also add old_passwords=0 to my.cnf and restart mysql.