Brute force attack with Hydra and Kali Linux
Hydra is a fast and flexible login cracker which can be used on both Linux and Windows, and supports protocols like AFP, HTTP-FORM-GET, HTTP-GET, HTTP-FORM-POST, HTTP-HEAD, HTTP-PROXY, and many more.
Hydra is installed by default on Kali Linux. There are both command line and graphical versions of Hydra, but real developers use command line, right?! ;-)