My domain is: meeting.ippbxsupport.net
I ran this command:
certbot certonly --standalone -d meeting.ippbxsupport.net --dry-run
It produced this output:
Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator standalone, Installer None Obtaining a new certificate Performing the following challenges: http-01 challenge for meeting.ippbxsupport.net Waiting for verification... Cleaning up challenges Failed authorization procedure. meeting.ippbxsupport.net (http-01): urn:ietf:params:acme:error:connection :: The server could not connect to the client to verify the domain :: During secondary validation: Fetching http://meeting.ippbxsupport.net/.well-known/acme-challenge/QHRJxOI3jJwYeHNN5I99RFU3JgA8w_odLSE6vxCySFk: Timeout during connect (likely firewall problem) IMPORTANT NOTES: - The following errors were reported by the server: Domain: meeting.ippbxsupport.net Type: connection Detail: During secondary validation: Fetching http://meeting.ippbxsupport.net/.well-known/acme-challenge/QHRJxOI3jJwYeHNN5I99RFU3JgA8w_odLSE6vxCySFk: Timeout during connect (likely firewall problem) 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. Additionally, please check that your computer has a publicly routable IP address and that no firewalls are preventing the server from communicating with the client. If you're using the webroot plugin, you should also verify that you are serving files from the webroot path you provided.
My web server is (include version): Apache/2.4.38
The operating system my web server runs on is (include version): Debian 10
I can login to a root shell on my machine (yes or no, or I don't know): yes
The version of my client is (e.g. output of
certbot --version or
certbot-auto --version if you're using Certbot): certbot 0.31.0
I don't think this is a firewall issue as port 80 is for sure open (IP tables [-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT]), and I see traffic coming to the server as seen by tcpdump.
14:18:55.698619 IP OpenMeeting1.localdomain.http > ec2-52-58-118-98.eu-central-1.compute.amazonaws.com.37426: Flags [S.], seq 1990738094, ack 1144139237, win 65160, options [mss 1460,sackOK,TS val 3992395219 ecr 1317580820,nop,wscale 7], length 0
14:18:55.698655 IP OpenMeeting1.localdomain.http > ec2-34-211-60-134.us-west-2.compute.amazonaws.com.59886: Flags [S.], seq 2317221856, ack 3240802948, win 65160, options [mss 1460,sackOK,TS val 1408025420 ecr 1221156813,nop,wscale 7], length 0
And I see certbot listening on port 80
certbot 13474 root 8u IPv6 129671 0t0 TCP *:80 (LISTEN)