MYSQL - Client does not support authentication protocol requested by server

I orignally had MYSQL5 and PHP5 installed however I had to roll back to version 4 of PHP and version 4 of mySQL. After a few issues I managed to get PHP and mySQL setup again however when I try and run my php/mysql driven site I get this error:

Warning: mysql_connect(): Client does not support authentication protocol requested by server; consider upgrading MySQL client


Any ideas? Help greatly appreciated. Also I have looked on the mysql and php webpage and cannot find a solution.

 

 

 

 

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