Per: "your server may be slow or overloaded" acme-v02.api - #4 by MikeMcQ My domain is: webhost19.inspire.net.nz I ran this command: sudo certbot renew --cert-name=webhost19.inspire.net.nz It produced this output: Saving debug log to /var/log/letsencrypt/letsencrypt.log - - - - - - - - - - - - …

Also echoing this issue (again from New Zealand). Even a straight acme http request is failing in this manner: 23.178.112.107 - - [08/Dec/2025:15:29:51 +1300] "GET /.well-known/acme-challenge/Yn8ARHxO6XWEpY63naaHrIpRl2sJleZzJdt9G6W2scQ HTTP/1.1" 200 1488 "-" "Mozilla/5.0 (compatible; Let's Encrypt …

Could more affected folks please share packet captures, if possible? That'll help identify and confirm this pattern of problems.

tomryder-inspirenet / nvnoc Time permitting can you please test a renewal (--force-renew) from your affected server(s) with MTU at 1500. It will be good to keep the Let's Encrypt team aware that an issue persists, the trouble with a workaround is it masks an ongoing problem.

[image] jc-rimu: Time permitting can you please test a renewal I've just attempted a renewal for one of our certs and yes, the issue persists; same symptoms. We're not too worried for the moment as there are three possible workarounds (dropping MTU, switching to DNS-01, removing HTTPS redire…

Here are some statuses for New Zealand Internet, possibly related. https://status.internetnz.nz/ Our network status - check here for possible outages. One NZ. https://www.chorus.co.nz/help/tools/internet-outages-map

Hey team, We are also running servers within New Zealand and are all experiencing the same thing this week. They are connected via the 2degrees/Vocus network from Auckland. We have not been made aware of any upstream network configuration changes to our IP ranges. The differences we have from the …

Can you see in lowering your MTU fixes it, and if so, to what value? It seems there is likely some ISP or router, probably in New Zealand, which is dropping packets over a certain size.

A tcptraceroute on port 443 from the Let's Encrypt production service back to each of the affected servers we've identified really would help us enormously, even if only for us to bring to Cloudflare support to ask them what's going on, since this seems to be specific to New Zealand providers so far…

I can do that soon. Sorry, I haven't read all the posts, but for my own information: is this only happening from our primary perspective, and not secondaries (in AWS)?

HTTPS connection failures (timeouts) from validation servers

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Bruce5051 December 9, 2025, 1:00am 22

Here are some statuses for New Zealand Internet, possibly related.

https://status.internetnz.nz/
Our network status - check here for possible outages. One NZ.
https://www.chorus.co.nz/help/tools/internet-outages-map

"your server may be slow or overloaded" acme-v02.api

Topic		Replies	Views
"your server may be slow or overloaded" acme-v02.api Help	20	723	December 14, 2025
Failed to connect to the Let's Encrypt server https://acme-v02.api.letsencrypt.org Help	17	29538	October 24, 2019
Renew certificate failed due to secondary validation (again) Help	50	3414	October 1, 2022
Renew certificate failed due to secondary validation Help	31	2685	June 2, 2022
Timeout during cert renew - help Help	53	2354	September 2, 2022

HTTPS connection failures (timeouts) from validation servers

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