has used a script that configures the knockd service and firewall to only accept C2 connections from systems that use a specified sequence of knock ports.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: has used a script that configures the knockd service and firewall to only accept C2 connections from systems that use a specified sequence of knock ports. ### Response: T1205.001.