Is it normal for the Yafu server to be hitting my router hard on ports 80 and 443? Surely it doesn't care whether I have a web-service available on these ports - what is it doing?

We are talking heavy traffic here; ranging from 15 to 50 requests per SECOND

I'm not aware, that the yafu server connects to you.
The server runs at home and gets every 24h a new IP.

Do you have some logs of it?

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Sorry just saw this as notification didn't arrive. Thanks for prompt reply

I've actually installed a router with vastly superior firewall capabilities to block inbound 80/443 from Yafu server. Interestingly, the source changed to a domestic IP, dynamic.kabel-deutschland.de, over the weekend. I do have the IP if you want it? Probably better to send it by Private Message??

If you want full logs, I would need to open the firewall a little