My validation script got temporarily bugged out and it runs every minute to issue and renew certificates for my websites.
My HTTP authentication got broken temporarily, and I believe this led to an IP block for some reason even though historically when I have had a bug it has not.
Anyway, I would like to request an IP unblock for 45.43.30.26
I believe if Let’s Encrypt was blocking something, you would receive a reply containing some hints as to why. This looks more like networking issues, which could be specific to your hoster or its uplink for example. Also notice that the API is supposed to be queried over HTTPS, not HTTP (port 80 in your curl example), though with your query you would still be expected to get a 301 “Moved Permanently” reply.
Correct, if your IP was blocked you would get an HTTP status code and response that tells you your IP is blocked for too much traffic. That text also contains an email address to ask for an unblock.
1 <1 ms <1 ms <1 ms fritz.box [192.168.0.1]
2 5 ms 5 ms 4 ms 62.155.240.117
3 6 ms 6 ms 6 ms 217.239.55.26
4 6 ms 6 ms 6 ms 217.239.55.26
5 6 ms 5 ms 7 ms lag-10.edge4.Berlin1.Level3.net [4.68.73.5]
6 6 ms 6 ms 7 ms ae-2-3602.edge3.Berlin1.Level3.net [4.69.159.5]
7 7 ms 7 ms 6 ms unknown.Level3.net [212.162.40.34]
8 7 ms 7 ms 7 ms 172.65.32.248