Amazon Exam ANS-C00 Topic 9 Question 16 Discussion

A network engineer deploys an application in a private subnet in a VPC that connects to many external video feed providers using RTMP over the internet. A NAT gateway has been deployed in a public subnet and is working as expected. From the Amazon EC2 instance, the application is able to connect to all feed providers except one, which hangs when connecting. Manually testing a

connection from an Amazon EC2 instance in the public subnet to the problem feed indicates that the feed works as expected.

What is causing this issue?