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I have a question because of error which I Faced due to configs some other person made in aws :
Short Question is what port Does AWS S3 use to communicate to ec2-instance ?
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S3 is accessed using web-based protocols that use standard HTTP(S) and a REST-based application programming interface (API). Representational state transfer (REST) is a protocol that implements a simple, scalable and reliable way of talking to web-based applications.
The Amazon WorkSpaces client application requires outbound access on ports 443 (TCP) and 4195 (UDP and TCP).
Using the AWS Console Select the instance in the dashboard. In the lower panel, click the name of the security group used by the instance. The resulting page will display the details of the selected security group. In the lower panel, select the “Inbound” tab to display a list of all the ports allowing inbound traffic.
S3 is what is considered an HTTP REST API. It's an API that uses HTTP requests to get, put, post and delete data. The REST API is considered a “stateless” protocol, where the server does not store any state about the client sessions on its side.
http://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region
S3 supported protocols are
Its does not use different protocol / port wether it communicates with EC2 instance or non-AWS instance
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