MySQL Bugs: #7408: Some user can not log in

Bug #7408	Some user can not log in
Submitted:	18 Dec 2004 17:38	Modified:	18 Dec 2004 22:31
Reporter:	Frank Büttner	Email Updates:
Status:	Not a Bug	Impact on me:	None
Category:	MySQL Server	Severity:	S2 (Serious)
Version:	4.1.8	OS:	Fedor Core 2
Assigned to:		CPU Architecture:	Any

Description:
Hello i have a big problem.
I am writing  a c++ program with Qt where i access a mysql db.
Some users can log in and use the db. But one user can not. But the rights are ok. He can access my using the mysql programm. But when he try to login via my c++ programm he get this error:
Client does not support authentication protocol requestet by server, consider upgrading MySQL client.
But another user can log in. All from the same computer. One can an the other get the error. Where can i find out more?

How to repeat:
try to log in in the database.

We're sorry, but the bug system is not the appropriate forum for 
asking help on using MySQL products. Your problem is not the result 
of a bug.

Support on using our products is available both free in our forums
at http://forums.mysql.com and for a reasonable fee direct from our
skilled support engineers at http://www.mysql.com/support/

Thank you for your interest in MySQL.

Additional info:

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