Preventing traffic type DDOS (distributed rejection service) attack is essential for the VPS server in Hong Kong. These attacks are trying to overload the server by sending a large amount of false traffic to the server, resulting in unavailable services. Here are some ways to prevent traffic DDOS attacks:

　　Use DDOS protection services: Considering the use of special DDOS protection services or CDN providers, they usually have powerful DDOS protection measures. These services can detect and filter DDOS traffic to ensure that normal traffic is passed.

　　Configure the network firewall: configure the network firewall rules on VPS to minimize unnecessary traffic to enter the server. Only the necessary ports and protocols are allowed to be passed, and unwanted services are prohibited.

　　Use load balancing: Diversify the flow to multiple VPS instances, and use a load balanner to share the pressure of attack traffic. This can help reduce the burden on a single VPS server.

　　Configure automatic defense mechanism: configure the automatic defense mechanism on VPS, such as automatic blocking IP address or traffic restriction. These mechanisms can detect abnormal flow and automatically take measures to reduce the attack.

　　Use cloud firewall: If your VPS hosting is on the cloud platform, consider using the firewall service provided by the cloud provider. These firewalls can help filter malicious traffic.

　　Update and maintenance system: Make sure that all the software on your operating system and the server is the latest, and the security patches are applied in a timely manner. Overdue software may be easily attacked.

　　Surveillance flow: Set traffic monitoring and log records, and timely detect abnormal flow mode. This helps to discover the attack early and take measures to deal with it.

　　DDOS protection of cloud service providers: Understand whether your cloud service providers provide DDOS protection services and ensure that these functions have been enabled. Different cloud suppliers may provide different levels of protection.

　　Please note that the type and scale of DDOS attacks are different, so there is no common solution that can be applied to all situations. The combination uses multiple protection measures is usually the best practice to ensure that the server is exempted from the impact of traffic DDOS attacks. It is also important to cooperate with safety experts and evaluate your security strategy on a regular basis.