First time if you got this error when trying to access localhost via a browser, we do not want to panic. Need to check the permissions on the directory which is access control in configuration.

Apache does not have mod_rewrite enabled by default so for you need to install rewrite module in Apache server using below command,

If you have created the .PFX file from Windows Certificate Services. Suppose to use with Apache in Linux server, can convert PFX to .key and .cer certificate because of The PFX contains the entire certificate chain.

Once configured and restarting successfully on Apache. just it is not sure where you need serve from, so it's choosing your localhost

Once you have installed an Apache 2.2 version on Linux system, when open the website on browser shows an error,

On the previous post we explained to configure Reverse Proxy on Apache in Linux. If you may get an error 503 Service Unavailable on browser,

This post describes to configure two VirtualHost in apache, one is simple domain pointing, another one configure subdomain with reverse proxy.