Clavister created an innovative solution against Slow DDoS attacks on the network of NTT Broadband Platform (NTTBP), one of the large Wi-Fi providers in Japan, to be deployed early 2018. Slow DDoS, or Slow Distributed Denial-of-Service, is one of the threats that service providers operating on the Internet and the cloud are exposed to—a growing problem that needs addressing for security reasons. Using only conventional technology against DDoS doesn't suffice against Slow DDoS: Slow DDoS is designed to remain virtually invisible in DDoS detector software. Clavister discovered behavior patterns and algorithms of Slow DDoS attackers and prototyped a software that mitigates against this threat. With a Proof of Concept project on NTTBP's Wi-Fi network, Clavister and NTTBP confirm that the Slow DDoS detector works against Slow DDoS attack on the network. Through the PoC, two companies and MIRAIT modified the Slow DDoS detector to be adaptive with evolution of Slow DDoS attacks.