MySQL Forums :: .NET :: Client does not support authentication protocol requested by server; consider upgrading MySQL client

Well, I had the same problem (but whitout using BytFx), here is how I resolved it :

In mysql console, type "use mysql;" to choose mysql database.

Then type :
UPDATE user SET password = old_password('yourpassword') WHERE user = 'theuser';

'theuser' is the user you're using to connect to the database with your application.

and then type
FLUSH PRIVILEGES;

Maybe now that will work.

http://dev.mysql.com/doc/mysql/en/Old_client.html