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Nginx Stopped Working after installing Let's Encrypt on Ubuntu 20.04

Posted on January 21, 2021
Let's Encrypt
Nginx
Ubuntu 20.04
rubioli

By rubioli

I tried to install Let’s Encrypt on my Ubuntu 20.04 by following this article: https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-20-04#step-4-%E2%80%94-obtaining-an-ssl-certificate and after installing Nginx stopped working and I can’t start Nginx anymore.

These are a few of the tests:

#sudo vim /etc/nginx/sites-enabled/mydomain
server {

  server_name domain.com www.domain.com;

#sudo nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

#sudo systemctl start nginx
Job for nginx.service failed because the control process exited with error code.
See "systemctl status nginx.service" and "journalctl -xe" for details.

#sudo ufw status
Status: inactive

and certbot asked me: Please choose whether or not to redirect HTTP traffic to HTTPS, removing HTTP access. I selected to redirect. And when I visit my site without https I get 502 Bad Gateway and when I go with https I get domain.com refused to connect.

Any help is appreciated and thanks in advance



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0
rubioli
rubioli
January 21, 2021

Accepted Answer

I did sudo fuser -k 80/tcp and did service nginx restart and site is up again.

A big thanks to @bobbyiliev

0
Bobby Iliev
Bobby Iliev
January 21, 2021

Hi there,

I could suggest first checking your Nginx error log for some more information on why the service is crashing. You can do that with the following command:

  1. sudo tail -100 /var/log/nginx/error.log

Another thing you could do is to run the journalctl -xe as per the output of the Nginx start command.

Feel free to share the errors here. Regards, Bobby

0
rubioli
rubioli
January 21, 2021

Thanks @bobbyiliev for your reply

These are the complete outputs:

#sudo tail -100 /var/log/nginx/error.log
2021/01/21 10:28:55 [crit] 201626#201626: *43 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 128.14.134.170, server: domain.com, request: "GET / HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "206.189.7.79"
2021/01/21 10:29:00 [crit] 201626#201626: *42 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 77.16.221.12, server: domain.com, request: "GET / HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 10:32:56 [crit] 201626#201626: *47 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.234, server: domain.com, request: "GET /posts/painal-alert-dillion-harper-s-hardcore-anal-sex/s/1 HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 10:40:08 [crit] 201626#201626: *49 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.234, server: domain.com, request: "GET /posts/young-sexy-teen-nude-yoga/s/2 HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 10:47:01 [crit] 201626#201626: *51 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /snaps/girl-teasing-boobs-and-playing-with-panties-on HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 10:47:20 [crit] 201626#201626: *53 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.232, server: domain.com, request: "GET /posts/unbelievable-porn-stars-photos-before-and-after-applying-make-up-part-1/s/2 HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 10:51:34 [info] 202078#202078: Using 32768KiB of shared memory for nchan in /etc/nginx/nginx.conf:63
2021/01/21 10:51:35 [notice] 202081#202081: signal process started
2021/01/21 10:51:35 [error] 202081#202081: invalid PID number "" in "/run/nginx.pid"
2021/01/21 10:51:35 [emerg] 202082#202082: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 10:51:35 [emerg] 202082#202082: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 10:51:35 [emerg] 202082#202082: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 10:51:35 [emerg] 202082#202082: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 10:51:35 [emerg] 202082#202082: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 10:51:35 [emerg] 202082#202082: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 10:51:35 [emerg] 202082#202082: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 10:51:35 [emerg] 202082#202082: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 10:51:35 [emerg] 202082#202082: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 10:51:35 [emerg] 202082#202082: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 10:51:35 [emerg] 202082#202082: still could not bind()
2021/01/21 10:51:38 [notice] 202083#202083: signal process started
2021/01/21 10:51:38 [error] 202083#202083: invalid PID number "" in "/run/nginx.pid"
2021/01/21 10:51:38 [emerg] 202084#202084: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 10:51:38 [emerg] 202084#202084: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 10:51:38 [emerg] 202084#202084: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 10:51:38 [emerg] 202084#202084: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 10:51:38 [emerg] 202084#202084: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 10:51:38 [emerg] 202084#202084: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 10:51:38 [emerg] 202084#202084: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 10:51:38 [emerg] 202084#202084: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 10:51:38 [emerg] 202084#202084: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 10:51:38 [emerg] 202084#202084: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 10:51:38 [emerg] 202084#202084: still could not bind()
2021/01/21 10:52:02 [crit] 201626#201626: *55 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 77.16.221.12, server: domain.com, request: "GET / HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 10:52:30 [info] 202090#202090: Using 32768KiB of shared memory for nchan in /etc/nginx/nginx.conf:63
2021/01/21 10:54:32 [crit] 201626#201626: *58 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /posts/young-sexy-teen-nude-yoga/edit HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 10:54:54 [crit] 201626#201626: *61 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 77.16.221.12, server: domain.com, request: "GET / HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "www.domain.com"
2021/01/21 10:56:50 [crit] 201626#201626: *63 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 77.16.221.12, server: domain.com, request: "GET / HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 11:01:45 [crit] 201626#201626: *66 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /posts/unbelievable-porn-stars-photos-before-and-after-applying-make-up-part-3/edit HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 11:01:45 [crit] 201626#201626: *68 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.232, server: domain.com, request: "GET /robots.txt HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 11:08:57 [crit] 201626#201626: *70 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /robots.txt HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 11:16:30 [crit] 201626#201626: *72 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 209.141.60.195, server: domain.com, request: "GET /config/getuser?index=0 HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "206.189.7.79:80"
2021/01/21 11:17:14 [crit] 201626#201626: *74 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 83.175.105.76, server: domain.com, request: "GET /snaps/20-years-old-bitch-fucked-in-club-toilet HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com", referrer: "https://www.google.com/"
2021/01/21 11:17:38 [crit] 201626#201626: *76 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /robots.txt HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 11:26:20 [crit] 201626#201626: *78 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /robots.txt HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 11:28:01 [crit] 201626#201626: *80 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 185.23.230.44, server: domain.com, request: "GET / HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "206.189.7.79:80"
2021/01/21 11:30:33 [crit] 201626#201626: *82 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /robots.txt HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 11:37:45 [crit] 201626#201626: *84 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /robots.txt HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 11:47:01 [crit] 201626#201626: *86 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /robots.txt HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 11:59:20 [crit] 201626#201626: *89 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /robots.txt HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"
2021/01/21 12:02:15 [info] 202589#202589: Using 32768KiB of shared memory for nchan in /etc/nginx/nginx.conf:63
2021/01/21 12:03:38 [info] 202601#202601: Using 32768KiB of shared memory for nchan in /etc/nginx/nginx.conf:63
2021/01/21 12:03:38 [warn] 202601#202601: conflicting server name "domain.com" on [::]:80, ignored
2021/01/21 12:03:38 [warn] 202601#202601: conflicting server name "www.domain.com" on [::]:80, ignored
2021/01/21 12:03:38 [warn] 202616#202616: conflicting server name "domain.com" on [::]:80, ignored
2021/01/21 12:03:38 [warn] 202616#202616: conflicting server name "www.domain.com" on [::]:80, ignored
2021/01/21 12:03:38 [emerg] 202616#202616: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:03:38 [emerg] 202616#202616: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:03:38 [emerg] 202616#202616: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:03:38 [emerg] 202616#202616: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:03:38 [emerg] 202616#202616: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:03:38 [emerg] 202616#202616: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:03:38 [emerg] 202616#202616: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:03:38 [emerg] 202616#202616: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:03:38 [emerg] 202616#202616: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:03:38 [emerg] 202616#202616: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:03:38 [emerg] 202616#202616: still could not bind()
2021/01/21 12:03:53 [info] 202628#202628: Using 32768KiB of shared memory for nchan in /etc/nginx/nginx.conf:63
2021/01/21 12:03:53 [warn] 202628#202628: conflicting server name "domain.com" on [::]:80, ignored
2021/01/21 12:03:53 [warn] 202628#202628: conflicting server name "www.domain.com" on [::]:80, ignored
2021/01/21 12:03:53 [warn] 202640#202640: conflicting server name "domain.com" on [::]:80, ignored
2021/01/21 12:03:53 [warn] 202640#202640: conflicting server name "www.domain.com" on [::]:80, ignored
2021/01/21 12:03:53 [emerg] 202640#202640: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:03:53 [emerg] 202640#202640: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:03:53 [emerg] 202640#202640: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:03:53 [emerg] 202640#202640: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:03:53 [emerg] 202640#202640: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:03:53 [emerg] 202640#202640: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:03:53 [emerg] 202640#202640: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:03:53 [emerg] 202640#202640: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:03:53 [emerg] 202640#202640: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:03:53 [emerg] 202640#202640: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:03:53 [emerg] 202640#202640: still could not bind()
2021/01/21 12:05:40 [info] 202663#202663: Using 32768KiB of shared memory for nchan in /etc/nginx/nginx.conf:63
2021/01/21 12:05:40 [warn] 202663#202663: conflicting server name "domain.com" on [::]:80, ignored
2021/01/21 12:05:40 [warn] 202663#202663: conflicting server name "www.domain.com" on [::]:80, ignored
2021/01/21 12:05:40 [warn] 202678#202678: conflicting server name "domain.com" on [::]:80, ignored
2021/01/21 12:05:40 [warn] 202678#202678: conflicting server name "www.domain.com" on [::]:80, ignored
2021/01/21 12:05:40 [emerg] 202678#202678: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:05:40 [emerg] 202678#202678: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:05:40 [emerg] 202678#202678: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:05:40 [emerg] 202678#202678: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:05:40 [emerg] 202678#202678: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:05:40 [emerg] 202678#202678: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:05:40 [emerg] 202678#202678: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:05:40 [emerg] 202678#202678: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:05:40 [emerg] 202678#202678: bind() to [::]:80 failed (98: Address already in use)
2021/01/21 12:05:40 [emerg] 202678#202678: bind() to 0.0.0.0:80 failed (98: Address already in use)
2021/01/21 12:05:40 [emerg] 202678#202678: still could not bind()
2021/01/21 12:13:44 [crit] 201626#201626: *92 connect() to unix:/tmp/passenger.NqSGkaJ/agents.s/core failed (2: No such file or directory) while connecting to upstream, client: 66.249.69.230, server: domain.com, request: "GET /robots.txt HTTP/1.1", upstream: "passenger:unix:/tmp/passenger.NqSGkaJ/agents.s/core:", host: "domain.com"

#journalctl -xe
Hint: You are currently not seeing messages from other users and the system.
      Users in groups 'adm', 'systemd-journal' can see all messages.
      Pass -q to turn off this notice.
-- A start job for unit UNIT has finished successfully.
-- 
-- The job identifier is 13.
Jan 21 09:42:42 Domain systemd[199844]: Listening on REST API socket for snapd user session agent.
-- Subject: A start job for unit UNIT has finished successfully
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- A start job for unit UNIT has finished successfully.
-- 
-- The job identifier is 9.
Jan 21 09:42:42 Domain systemd[199844]: Listening on D-Bus User Message Bus Socket.
-- Subject: A start job for unit UNIT has finished successfully
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- A start job for unit UNIT has finished successfully.
-- 
-- The job identifier is 10.
Jan 21 09:42:42 Domain systemd[199844]: Reached target Sockets.
-- Subject: A start job for unit UNIT has finished successfully
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- A start job for unit UNIT has finished successfully.
-- 
-- The job identifier is 5.
Jan 21 09:42:42 Domain systemd[199844]: Reached target Basic System.
-- Subject: A start job for unit UNIT has finished successfully
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- A start job for unit UNIT has finished successfully.
-- 
-- The job identifier is 2.
Jan 21 09:42:42 Domain systemd[199844]: Reached target Main User Target.
-- Subject: A start job for unit UNIT has finished successfully
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- A start job for unit UNIT has finished successfully.
-- 
-- The job identifier is 1.
Jan 21 09:42:42 Domain systemd[199844]: Startup finished in 135ms.
-- Subject: User manager start-up is now complete
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- The user manager instance for user 1000 has been started. All services queued
-- for starting have been started. Note that other services might still be starting
-- up or be started at any later time.
-- 
-- Startup of the manager took 135165 microseconds.
Jan 21 09:44:31 Domain sudo[200055]: pam_unix(sudo:auth): Couldn't open /etc/securetty: No such file or directory
Jan 21 09:44:32 Domain sudo[200055]: pam_unix(sudo:auth): Couldn't open /etc/securetty: No such file or directory
Jan 21 12:02:13 Domain sudo[202588]: pam_unix(sudo:auth): Couldn't open /etc/securetty: No such file or directory
Jan 21 12:02:15 Domain sudo[202588]: pam_unix(sudo:auth): Couldn't open /etc/securetty: No such file or directory

I’m really confused since it was working at first and it stopped suddenly.

Thanks in advance

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