Linux.com: Detect Weak Network Passwords with Hydra

“Security experts always advise you to use only strong
alphanumeric passwords for network applications, and change them
often, but you know that not everyone on your network is
security-conscious. Starting to worry that weak passwords may be
slipping through your defenses? Then it’s time to unleash Hydra, a
network login cracker for more than 30 network services.

“Hydra comes from The Hacker’s Choice (THC), a group that has
written more than 60 open source network security tools and
research papers. Hydra receives frequent updates and is the group’s
second most downloaded project…”