this post was submitted on 25 Feb 2025
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The ISP is blocking his ports too, it seems.
That’s an odd thing to see these days. I didn’t know ISPs still did that. I bet they offer a more expensive tier for businesses is why.
In my country no ISP will offer you a real IP address anymore. Not on IPv4 at least. So doesn't matter if your ports are blocked or not, you are CG-NATted in any case.
Should check which ports.
Mine blocks 80 inbound and 25 outbound, but everything else I've tried works. (so no default http, and no outbound email)
I only really want 443 for simplicity, everything else can be random ports.