Enable Remote Access to "httpd" Service

This section provides a tutorial example on how to enable remote access Web pages served by the 'httpd' service by opening the firewall for 'http' service default port 80.

Once Apache HTTP Server, httpd, is up and running, you may want to open the firewall to all users to access its Web pages remotely by following what I did on my CentOS computer.

1. Verify that httpd is listening to port 80:

herong$ nmap localhost

Nmap scan report for localhost (
Host is up (0.00017s latency).
Other addresses for localhost (not scanned): ::1
Not shown: 989 closed ports

22/tcp  open  ssh
80/tcp  open  http

2. Open the firewall for "http" service, which use the default port 80:

herong$ sudo firewall-cmd --zone=public --add-service=http

herong$ sudo firewall-cmd --runtime-to-permanent

3. Go to another computer on the local network and access the default Web page using IP address: I see the "HTTP SERVER TEST PAGE":

Apache HTTP Server httpd Test Page
Apache HTTP Server httpd Test Page

This confirms that my Web site can be accessed remotely.

Table of Contents

 About This Book

 Introduction to Linux Systems

 Process Management

 Files and Directories

Running Apache HTTP Server (httpd) on Linux Systems

 What Is Apache HTTP Server "httpd"

 Install Apache HTTP Server "httpd"

Enable Remote Access to "httpd" Service

 Publish Home Page index.html

 "apachectl status/start/stop" Commands

 Verify Apache HTTP Server "httpd" Environment

 Requirements for Supporting HTTPS on Apache

 Web Server Certificate and Required Fields

 Apache Configuration for HTTPS Protocol

 Common Issues with Apache HTTPS Support

 Listen to Non-Standard Ports with Apache

 Running Apache Tomcat on Linux Systems

 Running PHP Scripts on Linux Systems

 Running MySQL Database Server on Linux Systems

 Running Python Scripts on Linux Systems

 Conda - Environment and Package Manager

 GCC - C/C++ Compiler

 OpenJDK - Open-Source JDK

 Graphics Environments on Linux

 SquirrelMail - Webmail in PHP

 Tools and Utilities


 Full Version in PDF/EPUB