WIFI works, but wired connection does not on Linux

I have a simple network consisting of a internet modem/router supplied by my internet provider (Ziggo). This gives me WIFI and wired connections. I also have a website (hosted somewhere else) that's not doing anything now, and I purchased DNS redirection so that the DNS name of my website points to the ip address of my connection to my provider. If you like, you can try : www.hanslammerts.nl . Here's the strange thing: I can go to the website using my laptop and phone. I cannot go to the website from a freshly installed PC (running Debian 12) or another PC (running W10). I see a SYN-SENT and e

Question by notaverygoodprogrammer on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.