(mysql.info) old-client

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(mysql.info) can-not-connect-to-server

(mysql.info) common-errors

(mysql.info) password-too-long

 
 A.2.3 `Client does not support authentication protocol'
 -------------------------------------------------------
 
 MySQL 5.0 uses an authentication protocol based on a password hashing
 algorithm that is incompatible with that used by older (pre-4.1)
 clients. If you upgrade the server from 4.1, attempts to connect to it
 with an older client may fail with the following message:
 
      shell> mysql
      Client does not support authentication protocol requested
      by server; consider upgrading MySQL client
 
 To solve this problem, you should use one of the following approaches:
 
    * Upgrade all client programs to use a 4.1.1 or newer client library.
 
    * When connecting to the server with a pre-4.1 client program, use
      an account that still has a pre-4.1-style password.
 
    * Reset the password to pre-4.1 style for each user that needs to
      use a pre-4.1 client program. This can be done using the `SET
      PASSWORD' statement and the `OLD_PASSWORD()' function:
 
           mysql> SET PASSWORD FOR
               -> 'SOME_USER'@'SOME_HOST' = OLD_PASSWORD('NEWPWD');
 
      Alternatively, use `UPDATE' and `FLUSH PRIVILEGES':
 
           mysql> UPDATE mysql.user SET Password = OLD_PASSWORD('NEWPWD')
               -> WHERE Host = 'SOME_HOST' AND User = 'SOME_USER';
           mysql> FLUSH PRIVILEGES;
 
      Substitute the password you want to use for `NEWPWD' in the
      preceding examples. MySQL cannot tell you what the original
      password was, so you'll need to pick a new one.
 
    * Tell the server to use the older password hashing algorithm:
 
        1. Start `mysqld' with the -old-passwords option.
 
        2. Assign an old-format password to each account that has had
           its password updated to the longer 4.1 format. You can
           identify these accounts with the following query:
 
                mysql> SELECT Host, User, Password FROM mysql.user
                    -> WHERE LENGTH(Password) > 16;
 
           For each account record displayed by the query, use the
           `Host' and `User' values and assign a password using the
           `OLD_PASSWORD()' function and either `SET PASSWORD' or
           `UPDATE', as described earlier.
 
 * In older versions of PHP, the `mysql' extension does not
 support the authentication protocol in MySQL 4.1.1 and higher. This is
 true regardless of the PHP version being used. If you wish to use the
 `mysql' extension with MySQL 4.1 or newer, you may need to follow one
 of the options discussed above for configuring MySQL to work with old
 clients. The `mysqli' extension (stands for "MySQL, Improved"; added in
 PHP 5) is compatible with the improved password hashing employed in
 MySQL 4.1 and higher, and no special configuration of MySQL need be
 done to use this MySQL client library. For more information about the
 `mysqli' extension, see `http://php.net/mysqli'.
 
 It may also be possible to compile the older `mysql' extension against
 the new MySQL client library. This is beyond the scope of this Manual;
 consult the PHP documentation for more information. You also be able to
 obtain assistance with these issues in our MySQL with PHP forum
 (http://forums.mysql.com/list.php?52).
 
 For additional background on password hashing and authentication, see
  password-hashing.
 

Info Catalog

(mysql.info) can-not-connect-to-server

(mysql.info) common-errors

(mysql.info) password-too-long