Hi, as far as the first question, you could try using the
VPC Reachability Analyzer to find out if there's a permissions or networking issue. You can search for that tool in the console, then click
Create and analyze path. In the form that follows choose Source type as Internet Gateways and choose your internet gateway, Destination type VPC Endpoints and choose your VPC Endpoint that corresponds to your AS2 server, and finally set the destination port as 5080.
Another place I would look at is the Security Group permissions of your VPC.
Finally for Transfer Id, this is an identifier that is associated with a file transfer. All requests that are part of a StartFileTransfer call share a transfer-id.
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