LinuxQuestions.org - [SOLVED] unable to install letsencrypt certificate with apache

I'm trying to install a let's encrypt certificate on my Centos 7 running Apache, running:

Code:

certbot --apache -d mydomain.com -d www.mydomain.com -d mail.mydomain.com

But the following error occurs:

Code:

Error while running apachectl graceful.



Job for httpd.service invalid.





IMPORTANT NOTES:

 - The following errors were reported by the server:



  Domain: mail.mydomain.com

  Type:  connection

  Detail: Failed to connect to SERVER'S IP:443 for TLS-SNI-01

  challenge



  Domain: mydomain.com

  Type:  connection

  Detail: Failed to connect to SERVER'S IP:443 for TLS-SNI-01

  challenge



  Domain: www.mydomain.com

  Type:  connection

  Detail: Failed to connect to SERVER'S IP:443 for TLS-SNI-01

  challenge



  To 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.

This is my httpd.conf (it's default, really, with the exception of the last line - IncludeOptional):

Code:

ServerRoot "/etc/httpd"

Listen 0.0.0.0:80

Include conf.modules.d/*.conf

User apache

Group apache

ServerAdmin root@localhost

<Directory />

    AllowOverride none

    Require all denied

</Directory>

DocumentRoot "/var/www/html"

<Directory "/var/www">

    AllowOverride None

    Require all granted

</Directory>

<Directory "/var/www/html">

    Options Indexes FollowSymLinks

    AllowOverride None

    Require all granted

</Directory>

<IfModule dir_module>

    DirectoryIndex index.html

</IfModule>

<Files ".ht*">

    Require all denied

</Files>

ErrorLog "logs/error_log"

LogLevel warn

<IfModule log_config_module>

    LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined

    LogFormat "%h %l %u %t \"%r\" %>s %b" common

    <IfModule logio_module>

      LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio

    </IfModule>

    CustomLog "logs/access_log" combined

</IfModule>

<IfModule alias_module>

    ScriptAlias /cgi-bin/ "/var/www/cgi-bin/"

</IfModule>

<Directory "/var/www/cgi-bin">

    AllowOverride None

    Options None

    Require all granted

</Directory>

<IfModule mime_module>

    TypesConfig /etc/mime.types

    AddType application/x-compress .Z

    AddType application/x-gzip .gz .tgz

    AddType text/html .shtml

    AddOutputFilter INCLUDES .shtml

</IfModule>

AddDefaultCharset UTF-8

<IfModule mime_magic_module>

    MIMEMagicFile conf/magic

</IfModule>

EnableSendfile on

IncludeOptional conf.d/*.conf

IncludeOptional sites-enabled/*.conf

I also have /etc/httpd/sites-enabled/mydomain.com.conf:
<VirtualHost *:80>
ServerName domain.com
ServerAlias www.mydomain.com
DocumentRoot /var/www/html
ErrorLog /var/log/httpd/caleidoscop.xyz/error.log
</VirtualHost>

And on ssl.conf there's a Listen 443 directive.

After I run the certbot command, Apache is stopped for some reason. But if I start it again, it works fine. On netstat both 80 and 443 show up as listening ports.

The Apache welcome test page works both with the server's ip and with the domain.