{"action":"opened","issue":{"url":"https://api.github.com/repos/certbot/certbot/issues/5631","repository_url":"https://api.github.com/repos/certbot/certbot","labels_url":"https://api.github.com/repos/certbot/certbot/issues/5631/labels{/name}","comments_url":"https://api.github.com/repos/certbot/certbot/issues/5631/comments","events_url":"https://api.github.com/repos/certbot/certbot/issues/5631/events","html_url":"https://github.com/certbot/certbot/issues/5631","id":300707062,"number":5631,"title":"Bad busy port detection on host when a VPS is listening TCP/80","user":{"login":"narcisgarcia","id":8535656,"avatar_url":"https://avatars2.githubusercontent.com/u/8535656?v=4","gravatar_id":"","url":"https://api.github.com/users/narcisgarcia","html_url":"https://github.com/narcisgarcia","followers_url":"https://api.github.com/users/narcisgarcia/followers","following_url":"https://api.github.com/users/narcisgarcia/following{/other_user}","gists_url":"https://api.github.com/users/narcisgarcia/gists{/gist_id}","starred_url":"https://api.github.com/users/narcisgarcia/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/narcisgarcia/subscriptions","organizations_url":"https://api.github.com/users/narcisgarcia/orgs","repos_url":"https://api.github.com/users/narcisgarcia/repos","events_url":"https://api.github.com/users/narcisgarcia/events{/privacy}","received_events_url":"https://api.github.com/users/narcisgarcia/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-02-27T16:44:51Z","updated_at":"2018-02-27T16:44:51Z","closed_at":null,"author_association":"NONE","body":"Devuan GNU/Linux 1.0 + OpenVZ\r\ncertbot installed using jessie-backports repository: Version 0.10.2\r\n\r\nAfter releasing TCP/80 from iptables, I run ($FQDN as www.example.net):\r\n`certbot certonly --standalone -d $FQDN`\r\n\r\n```\r\nStarting new HTTPS connection (1): acme-v01.api.letsencrypt.org\r\nObtaining a new certificate\r\nPerforming the following challenges:\r\nhttp-01 challenge for $FQDN\r\nCleaning up challenges\r\n\r\n-------------------------------------------------------------------------------\r\nThe program apache2 (process ID 450559) is already listening on TCP port 80.\r\nThis will prevent us from binding to that port. Please stop the apache2 program\r\ntemporarily and then try again.\r\n-------------------------------------------------------------------------------\r\nAt least one of the required ports is already taken.\r\n```\r\n\r\nHost has only 1 public IP, and redirects ports to OpenVZ containers. Some containers have Apache running and listening to port 80 and/or 443 (and more), but they are behind host traffic control.\r\nCertbot detects port 80 being listened by some process, but it's not a host process and this can't interfere to host listens to TCP/80 before containers.\r\n\r\nThis error can perhaps occur with LXC too."}}
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