Timeout during connect (likely firewall problem)

[chrysa95]

Hello,
I try this in command line sudo certbot certonly --standalone --standalone-supported-challenges http-01 -d cmob2.hopto.org and i am getting the following errors:

• The following errors were reported by the server:

  Domain: cmob2.hopto.org
  Type: connection
  Detail: Fetching
  http:https://cmob.hopto.org/.well-known/acme-challenge/mVPKxOtuNpdtQjpzygQu9lajiy1DAt4ptnwJaQuKwXg:
  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.

Any possible answers?

[karlp]

What does this have to do with mosquitto? Mosquitto isn't a webserver, it certainly doesn't support http based challenges, though with the libwebsockets and webroot serving you could possibly convince it to behave as one.