Shulou(Shulou.com)06/01 Report--

After accessing high defense, in order to ensure the maximum stability of the business and confirm the problem, Mohist security is recommended to switch to local testing. The local test steps are: a. First, modify the local hosts file to make the local request for the protected site go through high defense. Take the Windows operating system as an example: find the Hosts file. Generally, the Hosts file is located in the C:\ Windows\ System32\ drivers\ etc\ folder. Open the hosts file using a text editor such as notepad or Notepad++. Finally, add the following: take www.test.com as an example, add the following to the last line of the hosts file: host binding

Note: the previous IP address is the source server IP address, modify the hosts file and save it.

b. Run the Ping command on the protected domain name on the local computer. The IP address expected to be resolved is the source server IP address bound in the hosts file. If it is still a high-defense IP address, try flushing the local DNS cache (run the ipconfig/flushdns command in the command prompt attachment of Windows).

c. After confirming that the hosts binding is in effect (the domain name is resolved locally to the source server IP), open a browser and enter the domain name to visit the protected website. If the website is expected to visit normally, there is a problem on this side of the high defense. If the site cannot be accessed properly, verify that the site source server is configured correctly.

After configuring the load balancer, errors such as 500Internal Server Error,502 Bad Gateway,504 Gateway Timeout appear when visiting the website. The most common error is 502, that is, the high defense IP forwards the request to the origin server, but the origin server does not respond. The origin server does not respond because the origin server IP may be blocked by the firewall of the origin server. An error of 500 indicates (server internal error) that the server encountered an error and was unable to complete the request. The error of 504 indicates that the gateway timed out and the server acted as a gateway or proxy, but did not receive the request from the upstream server in time. This may be caused by a variety of reasons. For example, operator interception, client abnormal behavior leading to high defense blocking, misconfiguration of load balancer or failure of health check, back-end ECS Web application access problems, and so on.

Load balancer source programs need to do static and dynamic separation, static files to do cache acceleration, page structure to use the load of the div+css; server to do response processing, such as increasing concurrency, database acceleration. Distributed deployment and so on. After configuring the forwarding rules, we strongly recommend that you disable the firewall and any other security software on the origin server to ensure that the high-defense origin-pull IP is not affected by the origin server security policy.

Focusing on website problems and other troubleshooting, it is beneficial to access high defense to quickly clean data traffic and effectively resist *, so that users' business can operate normally and minimize losses.

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