Help Center/ NAT Gateway/ FAQs/ Public NAT Gateways/ Which Ports Cannot Be Accessed?
Updated on 2025-10-31 GMT+08:00
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Which Ports Cannot Be Accessed?

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.

Table 1 High-risk ports

Protocol

Port

TCP

42 135 137 138 139 444 445 593 1025 1068 1433 1434 3127 3128 3129 3130 4444 4789 4790 5554 5800 5900 8998 9995 9996

UDP

135~139 1026 1027 1028 1068 1433 1434 4789 4790 5554 9995 9996
Parent topic: Public NAT Gateways