I haven’t been able to get past this error after a few hours of trying. My router is open on 443 and 80 and NAT directed to the server and the firewall is disabled during the test. tcpdump shows a long (220 or so messages) conversation going through the port. When I ran tcpdump -vv it reported incorrect checksum on all outbound packets which seems a little odd:
192.168.1.10.49814 > 23.201.74.133.443: Flags [.], cksum 0x2427 (incorrect -> 0xa8b5), seq 4194, ack 11829, win 521, options [nop,nop,TS val 16903296 ecr 1323909653], length 0
I ran these commands to confirm nothing was holding on to the ports:
netstat -nlt | grep ':80\s’
netstat -nlt | grep ‘:443\s’
I see an http 400 in the log. Not sure what that’s about.
I can’t paste the log because I get ‘too many links’ for a new user, and I can’t upload it because I’m also a new user. If someone can tell me how to work around this I will reply with it, or I can email it to anyone who cares.
Thanks to all for help.
My domain is: ve3nrt.net
I ran this command: sudo certbot -n --email xxxx@ve3nrt.net --agree-tos --standalone certonly --preferred-challenges tls-sni -d ve3nrt.net
It produced this output:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Obtaining a new certificate
Performing the following challenges:
tls-sni-01 challenge for ve3nrt.net
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. ve3nrt.net (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Error getting validation data
IMPORTANT NOTES:
-
The following errors were reported by the server:
Domain: ve3nrt.net
Type: connection
Detail: Error getting validation dataTo fix these errors, please make sure that your domain name was
entered correctly and the DNS A 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): None
The operating system my web server runs on is (include version): Raspbian Stretch 9.1
My hosting provider, if applicable, is: N/A
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