I'm trying to connect to a mySQL database at http://bluesql.net, but when I try to connect, it gives this error:
Connect Error (2000) mysqlnd cannot connect to MySQL 4.1+ using old authentication
edit: This only applies if you are in control of the MySQL server... if you're not take a look at Mysql password hashing method old vs new
First check with the SQL query
SHOW VARIABLES LIKE 'old_passwords'
(in the MySQL command line client, HeidiSQL or whatever front end you like) whether the server is set to use the old password schema by default. If this returns
old_passwords,Off you just happen to have old password entries in the
user table. The MySQL server will use the old authentication routine for these accounts. You can simply set a new password for the account and the new routine will be used.
You can check which routine will be used by taking a look at the
mysql.user table (with an account that has access to that table)
SELECT 'User', 'Host', Length('Password') FROM mysql.user
This will return 16 for accounts with old passwords and 41 for accounts with new passwords (and 0 for accounts with no password at all, you might want to take care of those as well).
Either use the user management tools of the MySQL front end (if there are any) or
SET PASSWORD FOR 'User'@'Host'=PASSWORD('yourpassword'); FLUSH Privileges;
Host with the values you got from the previous query.) Then check the length of the password again. It should be 41 now and your client (e.g. mysqlnd) should be able to connect to the server.
see also the MySQL documentation: