What Can I Do If an IP Address Is Blocked?

Possible Causes

Anti-DDoS provides a maximum of 500 Mbit/s protection capacity free of charge (depending on the available bandwidth of HUAWEI CLOUD). HUAWEI CLOUD Anti-DDoS will trigger a black hole to block access from the Internet within a time period when detecting an ECS is under volumetric flood attacks.

Solution

You can use either of the following methods to unblock the IP address:

• The system automatically deactivates the black hole 24 hours after the IP address was blocked.

  If the system detects that the attack traffic still persists and exceeds the threshold, the IP address will be blocked again.

• Advanced Anti-DDoS (AAD) is recommended because it automatically deactivates the black hole 30 minutes, by default, after the black hole has been triggered. The duration of persistent black hole depends on the times of the black hole triggered and volume of peak attack traffic of the day, and it can be a maximum of 24 hours. If you need to permit access before a black hole becomes ineffective, upgrade Anti-DDoS to AAD and contact Huawei technical support.