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?
This is the answer. Pretty much every ISP blocks 80
They say it is because worms use it blah blah but it is exactly what you think. They don’t want you running a web server. You’re probably going to have to do the DNS challenge instead.
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Many home ISPs block port 80 and 25. You should be able to Google that and confirm. If that’s the case you’ll have to use a different method.
ISP said that it does not block port 80
Try something like https://www.webpagetest.org/ or any other “proxy” service to confirm for youself if it is publicly accessible.
to Google?
Google search “Does <isp name> block port 80”
This is the answer. Pretty much every ISP blocks 80 They say it is because worms use it blah blah but it is exactly what you think. They don’t want you running a web server. You’re probably going to have to do the DNS challenge instead.