CC (Challenge Collapsar) attack protection method and device

The invention discloses a CC (Challenge Collapsar) attack protection method and device. The method comprises the steps of obtaining IP (Internet Protocol) address of a client which initiates a transmission control protocol TCP connection request; determining whether the TCP connection request of the client is a CC attack or not according to the IP address; and rejecting an access of the client if the TCP connection request of the client is the CC attack. According to the technical solution provided by the embodiment of the method and the device, the request initiated by an abnormal client can be recognized and filtered, thereby rejecting the access of the client, reducing the use of server resources and improving a CC attack protection effect.