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I uninstalled Apache, and reinstalled it, and now when I try to start it I get the following error:

Syntax error on line 94 of /usr/local/psa/admin/conf/generated/13636697550.95452800_server.include:
Invalid command 'SSLEngine', perhaps misspelled or defined by a module not included in the server configuration

I did not try to enable SSL, or anything. I'm quite new to Linux, and Apache in general, so if somebody could help me with this, I would be infinitely grateful.

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up vote 7 down vote accepted

There is probably some forgotten configuration in /etc/httpd/conf or /etc/httpd/conf.d. Find (grep SSL /etc/httpd/{conf,conf.d} -r) and destroy it or install ssl module for Apache:

yum install mod_ssl
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In my case I had mod_ssl installed but it was not enabled. To do this I ran:

sudo a2enmod ssl
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Check whether you have already loaded mod_ssl in the httpd.conf file:

LoadModule ssl_module modules/
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