"Premature end of data" error with PHP

Question

I've just started using WAMP for a PHP project and I get the next errors related with this line of code:

$link=mysql_connect("localhost","myuser","mypas");

I read that I had to do the SET PASSWORD again with my old password, but it still does not work after restarting all services. I am using PHP 5.3.4 and MySQL 5.1.53 Any help? THANKS

Warning: mysql_connect() [function.mysql-connect]: Premature end of data (mysqlnd_wireprotocol.c:554) in C:\wamp\www\CDE\includes\baseDatos.php on line 5 
Call Stack 
1 0.0002 667312 {main}( ) ..\index.php:0 
2 0.0008 682416 include( 'C:\wamp\www\CDE\includes\seguridad.php' ) ..\index.php:2 
3 0.0010 690984 include( 'C:\wamp\www\CDE\includes\baseDatos.php' ) ..\seguridad.php:2 
4 0.0014 692368 mysql_connect ( ) ..\baseDatos.php:5 

( ! ) Warning: mysql_connect() [function.mysql-connect]: OK packet 1 bytes shorter than expected in C:\wamp\www\CDE\includes\baseDatos.php on line 5 
Call Stack 
1 0.0002 667312 {main}( ) ..\index.php:0 
2 0.0008 682416 include( 'C:\wamp\www\CDE\includes\seguridad.php' ) ..\index.php:2 
3 0.0010 690984 include( 'C:\wamp\www\CDE\includes\baseDatos.php' ) ..\seguridad.php:2 
4 0.0014 692368 mysql_connect ( ) ..\baseDatos.php:5 

( ! ) Warning: mysql_connect() [function.mysql-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 in C:\wamp\www\CDE\includes\baseDatos.php on line 5 
Call Stack 
1 0.0002 667312 {main}( ) ..\index.php:0 
2 0.0008 682416 include( 'C:\wamp\www\CDE\includes\seguridad.php' ) ..\index.php:2 
3 0.0010 690984 include( 'C:\wamp\www\CDE\includes\baseDatos.php' ) ..\seguridad.php:2 
4 0.0014 692368 mysql_connect ( ) ..\baseDatos.php:5 

Answer 1

I had the same problem and fixed it using an UPDATE query like this:

UPDATE mysql.user SET Password = PASSWORD('newpwd') WHERE Host = 'some_host' AND User = 'some_user';

Don't know why but SET Password didn't work.

To be sure that the problem is the one i think you should do this query on the mysql database:

SELECT
`user`.`Password`
FROM
`user`
WHERE
`user`.`User` = 'youruser' AND
`user`.`Host` = 'yourhost'

if the password doesn't start with a * the problem is that you still have the old encription

EDIT _ Here is a php function to create valid password for MYSQL (taken from here):

function mysql_41_password($in)
{
$p=sha1($in,true);
$p=sha1($p);
return "*".strtoupper($p);
}

Thene you can set the password manually:

//newpwd is the passowr dgenerated in php
UPDATE mysql.user SET Password = 'newpwd' WHERE Host = 'some_host' AND User = 'some_user';
FLUSH PRIVILEGES;