IP filtering

I’m developing an app using part of the AeroAPI. The server on which I deployed (a Hetzner one) seems to not get any reply from the API server (it gets an empty reply. Not even a 400/404 of any kind). The funny thing is, it’s ONLY that server that doesn’t get it. Other servers at hetzner work well. Is flightaware using filtering? Is it possible that my prefix is blocked for some reason? (I’ve had this server for over a year and did not do anything with the API until now)

@FlightAwareSupport