Weird 403 errors on subdomain

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1

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My domain is: tkdkid1000.net

I ran this command: sudo certbot --apache -d ci.tkdkid1000.net

It produced this output:

Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator apache, Installer apache Obtaining a new certificate Performing the following challenges: http-01 challenge for ci.tkdkid1000.net Waiting for verification... Cleaning up challenges Failed authorization procedure. ci.tkdkid1000.net (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from https://ci.tkdkid1000.net/.well-known/acme-challenge/4pHUxutZBpZywZD-skHr2aqeagBXwO5dP4SKB6msMaM [2606:4700:3030::6815:5e5d]: "\n\n<!--[if IE 7]> <html class="no-js " IMPORTANT NOTES: - The following errors were reported by the server: Domain: ci.tkdkid1000.net Type: unauthorized Detail: Invalid response from https://ci.tkdkid1000.net/.well-known/acme-challenge/4pHUxutZBpZywZD-skHr2aqeagBXwO5dP4SKB6msMaM [2606:4700:3030::6815:5e5d]: "\n\n<!--[if IE 7]> <html class="no-js " To fix these errors, please make sure that your domain name was entered correctly and the DNS A/AAAA record(s) for that domain contain(s) the right IP address.

My web server is (include version):
Server version: Apache/2.4.29 (Ubuntu) Server built: 2020-08-12T21:33:25

The operating system my web server runs on is (include version):"Ubuntu 18.04.5 LTS

My hosting provider, if applicable, is: N/A self hosted

I can login to a root shell on my machine (yes or no, or I don't know): yes

I'm using a control panel to manage my site (no, or provide the name and version of the control panel): no

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot 0.27.0

Earlier today I tried to setup some reverse proxies and things on my domain tkdkid1000.net, it worked for my main website on www, but subdomains are seeming glitched.

2

There is something listening on port 80 that isn't compliant.

curl -Iki http://ci.tkdkid1000.net/
curl: (56) Recv failure: Connection reset by peer

curl -4 http://ci.tkdkid1000.net/
curl: (56) Recv failure: Connection reset by peer