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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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[–] qprimed@lemmy.ml 2 points 8 months ago (1 children)

are you actually running a web server on that host? iirc, certbot will place a temporary token to be served by your web server (Apache, etc.) to show that you actually control the domain you are requesting a cert for.

I switched to DNS based retrieval as soon as let's encrypt offered it, so its been years since I retrieved certs via http.

[–] someoneFromInternet@lemmy.ml 0 points 8 months ago (1 children)

actually I'm not hosting any web servers currently )

[–] qprimed@lemmy.ml 0 points 8 months ago (1 children)

if you are using http cert retrieval, certbot needs a place put the temp. token to authenticate your contrrol of the domain your are creating a certificate for. usually that will be the same webserver you want to serve the certificate from.

if you are not running an actual weberver on port 80 that certbot can insert a token for, certbot cannot complete.

this is, of course, in addition to other possible issues such as ISP port blocking - but without a web server listening on TCP/80, you will have to use other authorization methods (like DNS) to generate a cert.

[–] someoneFromInternet@lemmy.ml 0 points 8 months ago (1 children)

what would you recommend to a newbie?

[–] valkyre09@lemmy.world 1 points 8 months ago

I use letsencrypt a lot, if firewalls are an issue I’ll use dns authentication.

If you are struggling and need a quick fix, the free tier of zero ssl will do a similar thing

https://zerossl.com/

I used it to get a cert for my printer