FTP - Login incorrect implies wrong password

If you connect to FTP and upload some files, you need another thread for that. But in case the server is configured for maximum connections from an IP and that limit is currently being reached by that new thread, the error message is not displayed, only the password prompt is popped up again. In this case you don't know what the problem is and the password request is coming back again and again.

Please show the last error message in password prompt, it may be vital.