ssi_last_modified on; ssi_silent_errors off; If your SHTML includes other .shtml files, ensure:
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sudo systemctl restart apache2 Create a test file test.shtml containing: sudo systemctl restart apache2 Create a test file test
chmod 644 header.shtml chown www-data:www-data header.shtml If page.shtml includes footer.shtml which includes page.shtml , the server will time out. Check your includes for loops. 4. Firewall or ModSecurity Blocks Some security modules block SSI directives (e.g., <!--#exec cmd="..." --> ). Disable dangerous directives in Apache: Firewall or ModSecurity Blocks Some security modules block
sudo apache2ctl -M | grep include (On RedHat/CentOS: httpd -M | grep include )
sudo a2enmod include sudo systemctl restart apache2 Navigate to the directory containing your SHTML files or edit your VirtualHost configuration. Add the following:
location /includes/ ssi on; internal;