# Failed authorization procedure. Timeout Ubuntu 16.04/Apache **URL:** \ **Category:** Help\ **Created:** [February 10, 2018, 9:06pm UTC](https://community.letsencrypt.org/t/failed-authorization-procedure-timeout-ubuntu-16-04-apache/52746 "2018-02-10T21:06:52Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![submarinesam](https://avatars.discourse-cdn.com/v4/letter/s/dfb087/32.png) [@submarinesam](https://community.letsencrypt.org/u/submarinesam)\ **Post date:** [February 10, 2018, 9:06pm UTC](https://community.letsencrypt.org/t/failed-authorization-procedure-timeout-ubuntu-16-04-apache/52746/1 "2018-02-10T21:06:52Z")
Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. [https://crt.sh/?q=example.com](https://crt.sh/?q=example.com)), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help. My domain is: [samserver.net](http://samserver.net) I ran this command: sudo certbot --authenticator webroot --installer apache It produced this output: name(s) (comma and/or space separated) (Enter ‘c’ to cancel): [samserver.net](http://samserver.net) Obtaining a new certificate Performing the following challenges: http-01 challenge for [samserver.net](http://samserver.net) Input the webroot for [samserver.net](http://samserver.net): (Enter ‘c’ to cancel): /var/www/html/ Waiting for verification… Cleaning up challenges Failed authorization procedure. [samserver.net](http://samserver.net) (http-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Fetching [http://samserver.net/.well-known/acme-challenge/\_\_7MU8fkf\_3wOB-zZzZuxK4UbrinkLLYWtyhS260n7w:](http://samserver.net/.well-known/acme-challenge/__7MU8fkf_3wOB-zZzZuxK4UbrinkLLYWtyhS260n7w:) Timeout IMPORTANT NOTES: - The following errors were reported by the server: My web server is (include version): apache2 (2.4.18-2ubuntu3.5) The operating system my web server runs on is (include version): Ubuntu Server 16.04 My hosting provider, if applicable, is: 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 ---
**Author:** ![\_az](https://avatars.discourse-cdn.com/v4/letter/_/22d042/32.png) [@\_az](https://community.letsencrypt.org/u/_az)\ **Post date:** [February 10, 2018, 9:10pm UTC](https://community.letsencrypt.org/t/failed-authorization-procedure-timeout-ubuntu-16-04-apache/52746/3 "2018-02-10T21:10:30Z")
The immediate reason for the failure is that your domain has an AAAA record but isn’t reachable over IPv6. ```auto $ curl -vv -6 --connect-timeout 10 samserver.net * About to connect() to samserver.net port 80 (#0) * Trying 2604:6000:ffc0:72:491b:fed4:387b:79dd... * Connection timed out after 10000 milliseconds * Closing connection 0 curl: (28) Connection timed out after 10000 milliseconds ``` ---
**Author:** ![submarinesam](https://avatars.discourse-cdn.com/v4/letter/s/dfb087/32.png) [@submarinesam](https://community.letsencrypt.org/u/submarinesam)\ **Post date:** [February 10, 2018, 9:27pm UTC](https://community.letsencrypt.org/t/failed-authorization-procedure-timeout-ubuntu-16-04-apache/52746/4 "2018-02-10T21:27:02Z")
Is that usually a problem with my DNS service. I’m using DYNU DNS and I have a record for that IPv6 address directed to my domain. ---
**Author:** ![\_az](https://avatars.discourse-cdn.com/v4/letter/_/22d042/32.png) [@\_az](https://community.letsencrypt.org/u/_az)\ **Post date:** [February 10, 2018, 9:30pm UTC](https://community.letsencrypt.org/t/failed-authorization-procedure-timeout-ubuntu-16-04-apache/52746/5 "2018-02-10T21:30:05Z")
The problem is that IPv6 address isn’t actually responding to internet traffic. So you could either: - Fix the IPv6 address/networking on the server so it actually responds to internet traffic on that IPv6 address, or - Give up on IPv6 and delete the AAAA record ---
**Author:** ![submarinesam](https://avatars.discourse-cdn.com/v4/letter/s/dfb087/32.png) [@submarinesam](https://community.letsencrypt.org/u/submarinesam)\ **Post date:** [February 10, 2018, 9:35pm UTC](https://community.letsencrypt.org/t/failed-authorization-procedure-timeout-ubuntu-16-04-apache/52746/6 "2018-02-10T21:35:25Z")
I deleted the AAAA record and it works . Thanks. ---
**Author:** ![system](https://global.discourse-cdn.com/letsencrypt/original/3X/c/a/ca6c06ea1ea201324bba7048c6841ce60236468d.png) [@system](https://community.letsencrypt.org/u/system)\ **Post date:** [March 12, 2018, 9:35pm UTC](https://community.letsencrypt.org/t/failed-authorization-procedure-timeout-ubuntu-16-04-apache/52746/7 "2018-03-12T21:35:33Z")
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