Help Center/ Host Security Service/ FAQs/ Brute-force Attack Defense/ How Do I Unblock an IP Address?
Updated on 2025-07-04 GMT+08:00
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How Do I Unblock an IP Address?

If five or more consecutive incorrect passwords are entered from the same IP address within 30 seconds, or the total number of incorrect passwords entered from the same IP address reaches 15 within 1 hour, HSS will generate an alarm for the latest user who entered an incorrect password from the IP address, and will block the IP address (for 12 hours by default) to prevent server intrusions caused by brute-force attacks. If a blocked IP address does not perform brute-force attacks in the default blocking duration, it will be automatically unblocked.

If a normal IP address is blocked by mistake (for example, after O&M personnel enter incorrect passwords for multiple times), you can unblock the IP address.

If you manually unblocked an IP address, but incorrect password attempts from this IP address reach the threshold again, this IP address will be blocked again.

Procedure

  1. Log in to the management console.
  2. In the upper left corner of the page, select a region, click , and choose Security & Compliance > Host Security Service.
  3. In the navigation tree on the left, choose Detection & Response > Alarms and click Server Alarms.
  4. In the Alarm Statistics area, click View Details under Blocked IP Addresses.
  5. In the blocked IP address list, select an IP address and click Cancel Interception.
  6. Wait for 1 to 2 minutes and check whether Status of the target attack source IP address is Unblocked. If yes, the blocking has been canceled.