The invention discloses a method and a
system for preventing DDOS (Distributed Denial of Service)
attack of a
zombie terminal. The method comprises the steps that an HSS
server receives and records a network bearing request initiated by a terminal, obtains a corresponding HSS error code and state information of the terminal, judges whether the terminal meets a preset number card judgment condition or not, and defines the terminal as a
zombie terminal if the terminal meets the preset number card judgment condition; after the terminal is judged to be a
zombie terminal, the HSS
server obtains an IMEI code of the terminal and sends the IMEI code to the
connection management platform; the
connection management platform issues a communication function closing instruction to
the Internet of Things card of the terminal; and
the Internet of Things card executes the received communication function closing instruction, closes the communication function of the terminal, and returns a closing result, so that the
connection management platform executes disassembly or shutdown
processing on
the Internet of Things card. According to the method, the zombie terminal is automatically found fundamentally, the operation of closing the communication function module is carried out on the zombie terminal, the problem that the zombie terminal initiates the DDOS
attack is thoroughly solved, and the communication success rate of the area is remarkably improved.