How to fix reliably determine the server’s fully qualified domain name
Apache2 could not reliably determine warning normally indicates that your host’s file does not contain an FQDN (fully qualified domain name) not everyone will use an FQDN on their cPanel NVMe server so when restarting Apache you may see the below warning.
Apache2 could not reliably determine
This is not a critical error and in some cases, some users may not need to fix this error. Users who see this error on cPanel servers should follow this guide and add the tag as required to the httpd configuration file.
* Restarting web server apache2 AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using SERVER-IP. Set the 'ServerName' directive globally to suppress this message
You can fix this issue by adding a ServerName tag to the httpd.conf file or the apache2 conf file
Ubuntu and Debian
echo "ServerName localhost" | sudo tee /etc/apache2/conf.d/fqdn
CentOS / RHEL
Add the below tag on its own line
Save and close the file then restart Apache. If you don’t already have a firewall on your cPanel server read our guide on how to install CSF to your server. CSF protects you from a range of attacks that could cause your server to become compromised by a malicious user.
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