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Randomly can not resolve host on web server running on ec2

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I have a ec2 server running nginx inside a docker container that uses lets encrypt for https. Randomly for extended periods of time (roughly 10min - 1hour) the host name can not be resolved when sending an https request and there are no nginx logs about the request. It can still be reached via http and it's IP address. Strangely, the domain always resolves when you curl the domain on the server itself.

Any idea what might be going on or what I could do debug this problem? It seems to me like something going on with the EC2 instance itself blocking requests.

I sit in a Tesla and translated this thread with Ai:

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