I recently installed Sugar CE 6.5.17 on Windows XP with APACHE 2.2 PHP 5.2.5 and MySQL 5.0.45 Our test environment). The whole process has worked smoothly however, is impossible to access the application, the logon screen shows me the error "You must specify a valid username and password". I have only two users and have tried both with the same result. Unfortunately, I have not implemented the IMAP feature so I can not ask for the password change. I tried accessing the database with the interface of the operating system and yes, I can access.