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If you prefer to have your VPS shielded behind a heavy firewall, why not. But in case you ever intend to do outgoing calls from the server on ports other then the default (80, 443, ...), prepare yourself to do some wrestling with the support and have the IPs of the hosts you want to connect ready. And it /will/ take some time. That's just one of the issues I had to repeatedly deal with. (Consuming some foreign service).

Probably that's why I encountered the limit of about 100 reqs per second when was stress testing my hetzner VPS from the outside.

As long as the default ones are open and without restriction I wouldnt have much problems.

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