Stuck on Let's Encrypt certificate issuance due to firewall issue even after opening necessary ports
Hello everyone,
I've been trying to set up a Mumble voice chat server on my home network using a Debian server. As part of the setup process, I need to obtain an SSL certificate from Let's Encrypt for secure HTTPS access to the server. However, I'm encountering an error when running the Certbot client to request the certificate.
I've checked my firewall rules and confirmed that I've opened port 80 as required for the Let's Encrypt verification process. Here's the relevant rule in my ufw configuration:
80/tcp ALLOW Anywhere
Despite this, I'm still getting the timeout error. Has anyone else encountered this issue before? What steps should I take to troubleshoot further?
Check that your ISP doesn't block inbound connections on port 80. In the US, there is a growing trend of residential providers blocking those and other common service-hosting connections upstream unless you change to a "business" account. You may also be behind a CGNAT ISP, unless you have successfully gotten external port-forwards working in the past. The second is much less likely, and I have only seen it from the new, smaller fiber startups popping up who were not around when the Class A Subnets were allocated...