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Hello.
What are the specific settings for the EC2 security group?
In particular, this time, if the API listening port is not allowed in the security group's inbound rules, a timeout error will occur.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/working-with-security-groups.html#adding-security-group-rule
Also, does EC2 have a public IP address set?
In that case, please make sure that the route to the Internet gateway is set in the route table of the subnet where EC2 is running.
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Route_Tables.html
If you have configured a network ACL on the subnet, please configure it to allow the API listening port for inbound and ephemeral ports (1024 to 65535) for outbound.
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-network-acls.html
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