Updated on 2026-07-28 GMT+08:00
Why Are Some Ports of ECSs Inaccessible?
When adding a security group rule, you must specify a port or port range for communications. Traffic is then allowed or denied if traffic matches this rule.
Table 1 lists some high-risk ports that are blocked by default. Even if you have added a security group rule to allow access over these ports, traffic over these ports in restricted regions is still denied. In this case, do not use these high-risk ports for your services.
Parent topic: Security
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