apache2 Invalid command 'SSLEngine'

Question

When I restart httpd, I get the following error. What am I missing?

[root@localhost ~]# service httpd restart
Stopping httpd:                                            [  OK  ]
Starting httpd: Syntax error on line 22 of /etc/httpd/conf.d/sites.conf:
Invalid command 'SSLEngine', perhaps misspelled or defined by a module not included in the server configuration

I have installed mod_ssl using yum install mod_ssl openssh

Package 1:mod_ssl-2.2.15-15.el6.centos.x86_64 already installed and latest version
Package openssh-5.3p1-70.el6_2.2.x86_64 already installed and latest version

My sites.conf looks like this

<VirtualHost *:80>
#    ServerName shop.itmanx.com
    ServerAdmin [email protected]

    DocumentRoot /var/www/html/magento
    <Directory /var/www/html>
        Options -Indexes
        AllowOverride All
    </Directory>

    ErrorLog logs/shop-error.log
    CustomLog logs/shop-access.log
</VirtualHost>

<VirtualHost *:443>
    ServerName secure.itmanx.com
    ServerAdmin [email protected]

    SSLEngine on
    SSLCertificateFile /etc/httpd/ssl/secure.itmanx.com/server.crt
    SSLCertificateKeyFile /etc/httpd/ssl/secure.itmanx.com/server.key
    SSLCertificateChainFile /etc/httpd/ssl/secure.itmanx.com/chain.crt

    DocumentRoot /var/www/html/magento
    <Directory /var/www/html>
        Options -Indexes
        AllowOverride All
    </Directory>

    ErrorLog logs/shop-ssl-error.log
    CustomLog logs/shop-ssl-access.log    
</VirtualHost>

score 179 · Answer 1 · edited Aug 22 '17 at 08:53

179

On many systems (Ubuntu, Suse, Debian, ...) run the following command to enable Apache's SSL mod:

sudo a2enmod ssl

a2enmod man page

edited Aug 22 '17 at 08:53

robsch

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answered Feb 18 '15 at 00:02

Stéphane

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4

This is Debian-specific but the question is not tagged Debian. – jordanm Feb 18 '15 at 01:32
2

is a2enmod really Debian specific? Or are you complaining about the use of sudo? – Stéphane Feb 18 '15 at 02:08
4

`a2enmod` is Debian specific. It manages symlinks for the way Debian splits apache configurations. Your command is the equivalent of `ln -s /etc/apache2/mods-{available,enabled}/ssl.load; ln -s /etc/apache2/mods-{available,enabled}/ssl.conf` – jordanm Feb 18 '15 at 03:43
1

`a2enmod` is also used on suse. – dr0i Feb 24 '16 at 16:01
..and on Ubuntu – YakovL Jul 15 '21 at 16:55

score 66 · Accepted Answer · answered Feb 10 '12 at 15:11

66

Probably you do not load the ssl module. You should have a LoadModule directive somewhere in your apache configuration files.

Something like:

LoadModule ssl_module /usr/lib64/apache2-prefork/mod_ssl.so

Usually apache configuration template has (on any distribution) a file called (something like) loadmodule.conf in which you should find a LoadModule directive for each module you load into apache at server start.

answered Feb 10 '12 at 15:11

andcoz

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Also, it's necessary to install `mod_ssl`. On RHEL and CentOS, this is done with `yum install mod_ssl`. – Benedikt Köppel Apr 18 '18 at 18:13
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For Apache 2.4 it is yum install mod24_ssl – Alejandro Pablo Tkachuk Mar 14 '19 at 16:58
12

`sudo a2enmod ssl` – thoni56 Aug 09 '19 at 13:46
@AlejandroPabloTkachuk there is No package mod24_ssl available. For me just `yum install mod_ssl` worked perfectly. – vijay Nov 01 '19 at 22:46
1

@vijay the name of the package and how to enable it is _distribution dependent_. In addition, the package name can change in time. – andcoz Nov 04 '19 at 14:55
What's the advantage of having both http and https ? We have really to duplicate the virtual records twice just to change *:80 to *:443 lines? How to cause the browser to switch automatically to httpS when typing mydomain.com on the address bar? – Meryan Mar 22 '21 at 08:41

Falco Preiseni · Answer 3 · 2017-04-09T09:37:15.850

31

On CentOS 7 installing the package "mod_ssl" and restarting the apache server worked for me:

yum install mod_ssl
systemctl restart httpd

edited Apr 09 '17 at 09:37

answered Apr 09 '17 at 09:24

Falco Preiseni

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It's work for me on CentOS 7. – Trần Hữu Hiền May 31 '21 at 06:49

score 18 · Answer 4 · answered Feb 16 '16 at 23:27

18

httpd24 solution:

yum install mod24_ssl

answered Feb 16 '16 at 23:27

dtbarne

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That presumably works for (some) RPM-based distributions only. Which one? Why does it fix the problem? – vonbrand Feb 17 '16 at 00:07
Worked on Amazon Linux and Centos for me. It's specifically for Apache 2.4. – dtbarne Feb 23 '16 at 16:39

score 3 · Answer 5 · edited Feb 15 '20 at 21:14

3

On Ubntu 18.04 bionic.

sudo a2enmod ssl
sudo service apache2 restart

edited Feb 15 '20 at 21:14

roaima

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answered Aug 15 '18 at 08:01

pumpkin_cat

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The second answer already recomends `sudo a2enmod ssl;` Maybe you should add a comment there to restart the server after the change. – Aug 15 '18 at 08:13

score 0 · Answer 6 · answered Feb 15 '20 at 21:07

I received the same error while installing the SSL Certificate on my website. I have fixed it by executing the following command in the terminal.

# yum install mod_ssl
# httpd -t
# systemctl restart httpd

I am sure that the above commands will fix your error.

apache2 Invalid command 'SSLEngine'

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