Accessing Non-website Applications

Last updated: 2020-07-30 11:29:03

    This document describes how to connect non-website applications to Anti-DDoS Advanced instances and verify the forwarding configuration.


    • To add a forwarding rule, you need to purchase an Anti-DDoS Advanced instance first.
    • To modify the DNS information of your business domain name, you need to purchase a domain name resolution product first.



    Configuring forwarding rules

    1. Log in to the Anti-DDoS Console and select Anti-DDoS Advanced > Access Configuration.

    2. On the Non-website Scenarios tab, find and select the target Anti-DDoS Advanced instance and add a forwarding rule.
      • Add one single forwarding rule:

    3. Click Create.

    4. On the Add forwarding rule page, configure the following parameters as needed and click OK.

    • Forwarding Protocol: TCP and UDP are supported currently.

    • Forwarding Port: this is the Anti-DDoS Advanced port used for access. You are recommended to choose the same port as that of the real server.

      Anti-DDoS Advanced does not support ports 1433, 1434, 3306, 3389, 36000, and 56000. Port 843 is supported in the Guangzhou and Beijing regions.

    • Real Server Port: the real port of your business site.

    • Forwarding Method: Forwarding via IP and Forwarding via domain name are supported.

    • Load Balancing Method: only weighted round-robin is supported currently.

    • Real Server IP + Weight or Real Server Domain Name: enter the real server IP + weight or real server domain name based on the forwarding method. Up to 20 pairs of IP + weight or domain names are supported.

      • If you check Forwarding via IP, enter the real server IP address + weight such as 50. If a domain name corresponds to multiple pairs of real server IP + weight, you can enter all of them and separate them with carriage return. Up to 20 entries are supported.

        The weight ranges from 1 to 100.

      • If you check Forwarding via domain name, enter the real server domain name. If one domain name corresponds to multiple real server domain names, you can enter all of them and separate them with carriage return. Up to 20 entries are supported.

      • Add forwarding rules in batches:

      1. Click Batch Import.
    1. In the rule input box on the batch import page, paste the rules to be imported.
    • From left to right, paste the forwarding protocol, forwarding port, real server port, real server IP, and weight and separate them with space. Only one forwarding rule can be entered per line.
    • The number of forwarding rule entries added in batches cannot exceed the current quota. Within the quota limit, up to 30 entries can be imported at a time.

    Opening the intermediate IP range

    To prevent service unavailability that occurs if the real server blocks Anti-DDoS Advanced's intermediate IP, you are recommended to configure allowlist policies for the real server infrastructure (such as firewall, web application firewall, intrusion protection system (IPS), and traffic management system) and disable the protection features of the host firewall and other security software tools (such as Safedog) or set allowlist policies for them, so that the intermediate IP will not be affected by the security policies of the real server.
    You can log in to the Anti-DDoS Console, select Anti-DDoS Advanced > Resource List on the left sidebar, find the row of the target Anti-DDoS Advanced instance, and click its ID/Name to view its detailed intermediate IP range on the Basic Information page that pops up.

    Verifying the configuration locally

    After the forwarding configuration is completed, the Anti-DDoS Advanced instance will forward messages from the relevant port to the corresponding real server port according to the forwarding rule.
    To ensure the stability of your business, a local test is recommended. The verification method is as follows:

    • For applications accessed through IPs
      For applications accessed through IPs (such as games), run telnet to check whether the Anti-DDoS Advanced port is accessible. You can also enter the Anti-DDoS Advanced IP as the server IP in your local client (if possible) to check whether the local client can access it.
      For example, if your Anti-DDoS Advanced IP is with forwarding port 1234, and your real server IP is with port 1234, when you run telnet locally to access, if the address can be accessed, the forwarding is successful.

    • For applications accessed through domain names
      For applications accessed through domain names, follow the steps below for verification:

      1. Modify your local hosts file to direct local requests to the protected site to your Anti-DDoS Advanced instance.
        Take Windows OS as an example:

        1. Open the hosts file (C:\Windows\System32\drivers\etc) and add the following content at the end of file:
          <Anti-DDoS Advanced IP address> <Domain name of the protected site>
          For example, if the Anti-DDoS Advanced IP is and the domain name is, then add:

        2. Save the hosts file.
      2. Run the ping command on the protected domain name on your local computer.
        If the resolved IP address is the Anti-DDoS Advanced IP address bound in the hosts file, the forwarding is successful.

        If the resolved IP address is still the real server IP address, try running the ipconfig/flushdns command in the Windows Command Prompt to clear the local DNS cache.

      3. After successfully configuring the hosts, check whether the domain name can be accessed.
        If yes, the configuration has taken effect.

    If the verification still fails with the correct method, please log in to the Anti-DDoS Console and check whether the configuration is correct. If the problem persists after you fix any incorrect configuration items, please contact Tencent Cloud technical support.

    Modifying the DNS resolution of the business domain name

    Before using Anti-DDoS Advanced, you need to configure the A record of your business domain name's DNS with an Anti-DDoS Advanced IP, so that all user access requests to your site will pass through Anti-DDoS Advanced first before arriving at the real server (that is, all traffic will be first directed to Anti-DDoS Advanced before getting to the real server).

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