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Hello.
Does accessing EC2's public IP address directly fail?
If access via IP address is successful, the domain name resolution may not be working properly.
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Hi, Yes, accessing the public IP directly address also fails.
Is communication allowed in the network ACL of the subnet where EC2 is running? Also, is a route to the Internet gateway set in the subnet route table?
I'm using the default VPC, and the Network ACL is associated with 3 subnets, also has inbound and outbound rules that allow all traffic. The subnets are associated to a route table, which targets an internet gateway. I compared all of the configuration under VPCs with my working us-east instance, an nothing seems out of normal.
Thank you for your help. I found out that ports 80 and 443 are by default blocked in China. To use them, you need an icp license and talk to aws support to unblock them.