A company hosts a web application on an Amazon EC2 instance in a production VPC. Client connections to the application are failing. A SysOps administrator inspects the VPC flow logs and finds the following entry:
2 111122223333 eni-<###> 192.0.2.15 203.0.113.56 40711 443 6 1 40 1418530010 1418530070 REJECT OK
What is a possible cause of these failed connections?
A. A security group is denying traffic on port 443.
B. The EC2 instance is shut down.
C. The network ACL is blocking HTTPS traffic.
D. The VPC has no internet gateway attached.

Respuesta :

The network ACL is blocking HTTPS traffic. And gathering broad information.

For usage details and additional information regarding the aforementioned commands, if necessary, see the operating system man pages and the IDS documentation. Execute the following commands, then gather the results: Run ps -elf several times for the client process on UNIX if it's still active. Run the client process's truss/trace on UNIX (if it's available). For some connections, a connection requires the use of a third-party API. Nothing more is necessary if the complete API has already been compiled in the connector. To use a map or process with some APIs, you must first install a client on the integration platform and connect to a server (usually a SQL engine) so that the connection can be made.

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