this post was submitted on 10 Mar 2024
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Stuck on Let's Encrypt certificate issuance due to firewall issue even after opening necessary ports (lemmy.ml)
submitted 8 months ago by someoneFromInternet@lemmy.ml to c/selfhosted@lemmy.world
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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.

Here's the command I'm running:

sudo certbot certonly -d mydomain.com

But I get the following error message:

Timeout during connect (likely firewall problem)

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?

Thanks in advance for any advice!

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[–] epyon22@programming.dev 10 points 8 months ago (3 children)

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.

[–] webhead@lemmy.world 6 points 8 months ago

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.

[–] someoneFromInternet@lemmy.ml 1 points 8 months ago (1 children)

to Google?

[–] epyon22@programming.dev 3 points 8 months ago

Google search "Does block port 80"

[–] someoneFromInternet@lemmy.ml 1 points 8 months ago (1 children)

ISP said that it does not block port 80

[–] kevincox@lemmy.ml 2 points 8 months ago

Try something like https://www.webpagetest.org/ or any other "proxy" service to confirm for youself if it is publicly accessible.