this post was submitted on 15 May 2026
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Need help figuring out how to write Let's Encrypt ACME servers into banIP allowlist (OpenWrt) (feddit.org)
submitted 2 months ago* (last edited 2 months ago) by Lemmchen@feddit.org to c/selfhosted@lemmy.world
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Recently I've installed luci-app-banip on my OpenWrt router and blocked most countries from accessing my services on my network. Not seeing why I would want any of that traffic I also blocked the whole of the ARIN registry, responsible for IP addresses from Canada and the United States.
Edit: Note this is only for inbound traffic. Outbound traffic is allowed no matter the target country.

Fast forward a few weeks and my certbot renewals fail with the following error: Failed to renew certificate enter.domain.here with error: HTTPSConnectionPool(host='acme-v02.api.letsencrypt.org', port=443): Read timed out. (read timeout=45)

Confused af I start looking for solutions and as so often only find useless or completely ridiulous solutions (lowering my MTU to 1300, what? WHY?). Finally I find some enlighted figure that says they recently enabled a blocklist for certain countries and that was the issue for them.
Now I make the connection to my use of banIP, re-allow the USA and my cert renewals start working again. Hooray!

However, there are two things bothering me:

  1. Why would such a block even interrupt my renewals? I'm using DNS challenges and the ACME servers should only check the DNS entries, not where those entries actually redirect to. The DNS server/root isn't in my home network, so isn't affected by any firewall shenanigans I do here.
  2. How can I make an exception for the Let's Encrypt ACME servers while blocking the rest of the ARIN IP space?

I see there's the option for ASN selection and external allowlists:

Does anybody have an idea on how to configure this so that Let's Encrypt continues to work without compromising on my network security?

(Edit: And just for clarity, I do not live in the US or anywhere on the American continent.)

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[–] Cyber@feddit.uk 5 points 2 months ago

Ok, bare with me, I've had roo muxh to drink, but, don't ban the world, only allow countries you want.

Now, Let's Encrypt is a US entity, so whilst you might not want to allow the US in, perhaps allow countries + Let's Encrypt subnet

Also... still block some countries for outbound too... like blocking any C&C destinations.

If I'm waay off, sorry, I'll try to respond in the morning when I'm not drunk.