Can the question if the error page appears on the website hosted in Apache kok appear complete version and Linux distro that is used along with IP address. Yes like this:
Apache 2.4.20 (Debian) Server at 192.168.1.73 Port 443
The intention is to remove the additional information for security reasons.
This is very easy, but it needs to edit the Apache configuration:
Then in it find the line and change the value from On to Off as below:
Finally restart the Apache web server process:
service apache2 restart
service httpd restart
Completed and can be tested again. There should not be any information other than the error itself.