i psoted a message here before few days asking how to solve this problem, fortunately 
i found the solution on a website, i reseted the pass and all worked.
 
MySQL 4.1 uses an authentication protocal based on a password hashing algorithm that 
is incompatible with that used by older clients. If you upgrade the server to 4.1, 
attempts to connect to a 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 do one of the following: 
Upgrade all client programs to use the 4.1.1 or newer client library. 
Use a user account with an old password when connecting from a pre 4.1 client. 
Reset the user that needs a pre-4.1 client to use an old password: 
          mysql> UPDATE user SET Password = OLD_PASSWORD('mypass')
              -> WHERE Host = 'some_host' AND User = 'some_user';
          mysql> FLUSH PRIVILEGES;
          
Tell the server to use the older password hashing algorithm: 
Start mysqld with --old-passwords. 
Set the password for all users that has a long password. You can find these users 
with: 
               SELECT * FROM mysql.user WHERE LEN(password) > 16;

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