The user prompts the following error when accessing the website on the ECS server.
Because you use Web Application Firewall or other security products, when you visit websites that may pose security threats to ECS instances, you will receive a 405 error, that is, the access is blocked.
Alibaba Cloud reminds you that:
- Before you perform operations that may cause risks, such as modifying instance configurations or data, we recommend that you check the disaster recovery and fault tolerance capabilities of the instances to ensure data security.
- If you modify the configurations and data of instances including but not limited to ECS and ApsaraDB RDS (RDS) instances, we recommend that you create snapshots or enable RDS log backup.
- If you have authorized or submitted security information such as the logon account and password in the Alibaba Cloud Management Console, we recommend that you modify such information in a timely manner.
In this case, if you confirm that the website business is normal, see Set a whitelist to solve the problem of blocking IP addresses due to misjudgment, configure access rules to allow specific URLs or source IP addresses.
- Web Application Firewall (WAF)