Port 80 not open linux

Can’t listen on port 80 with my server

Very new on this kind of issue, i am trying to launch a server on the port 80 (it’s important to me to use this specific port). It’s fails, but it works on other ports (even < 1024 when i am root, but still fail on the port 80). I probably have something running on the port 80, i would like to identify it in order to change its listening port. I saw this cmd can help to see the state of a specific port: netstat -ano|grep 80|grep LISTEN but i am not sure tu understand well the result. Here is what i get:

tcp 0 0 127.0.0.1:28017 0.0.0.0:* LISTEN off (0.00/0/0) tcp6 0 0 . 80 . * LISTEN off (0.00/0/0) unix 2 [ ACC ] STREAM LISTENING 8805 /tmp/mongodb-27017.sock unix 2 [ ACC ] STREAM LISTENING 13112 /home/me/.pulse/04d802bb34ddb9da49b1f9060000000b-runtime/native 

I read on the line 2 that the port 80 seems to be not listening, but don’t understand further. UPDATE: sudo lsof -i :80

COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME apache2 1107 root 4u IPv6 7630 0t0 TCP *:http (LISTEN) apache2 1131 www-data 4u IPv6 7630 0t0 TCP *:http (LISTEN) apache2 1132 www-data 4u IPv6 7630 0t0 TCP *:http (LISTEN) apache2 1133 www-data 4u IPv6 7630 0t0 TCP *:http (LISTEN) apache2 1134 www-data 4u IPv6 7630 0t0 TCP *:http (LISTEN) apache2 1136 www-data 4u IPv6 7630 0t0 TCP *:http (LISTEN) ubuntu-ge 2095 me 7u IPv4 82145 0t0 TCP me-Ubuntu.local:43345->mulberry.canonical.com:http (CLOSE_WAIT) 

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Step-by-Step Guide: How to Open Port 80 on Windows, Linux and Router

Learn how to open Port 80 on Windows, Linux and Router with our step-by-step guide. Secure your network with our best practices and prevent security risks. Follow our guide now!

• Introduction
• Definition of Port 80
• Open Port 80 in Windows 10
• Importance of Opening Port 80
• Overview of the Article
• Opening Port 80 on a Router
• Opening Port 80 in Windows Firewall
• Opening Port 80 in Linux
• Security Risks of Open Port 80
• Troubleshooting Port 80 Issues
• Checking if Port 80 is Open
• Connecting to Port 80
• Best Practices for Securing Open Ports
• Other code examples for opening Port 80
• Conclusion
• Why port 80 is not open?
• How do I open port 80 Router?
• How do I know if port 80 is open?
• How do I connect to port 80?

Introduction

In the world of IT and software development, communication is key, and opening ports is essential for enabling communication between devices. Port 80 is a communication channel used for HTTP requests and is an essential port for web browsing. In this article, we will discuss how to open port 80 on a router, Windows and Linux operating systems, and best practices for securing open ports .

Definition of Port 80

Port 80 is a communication channel used for HTTP requests. HTTP stands for Hypertext Transfer Protocol, which is the foundation of data communication on the World Wide Web. It is responsible for transmitting data across the internet, and it uses port 80 as its default port.

Open Port 80 in Windows 10

Open Port 80 in Windows 10. 3.6K views 4 years ago. Breaking News. Breaking News. 4.35K Duration: 2:40

Importance of Opening Port 80

Opening port 80 is essential for enabling web browsing and communication between devices. If port 80 is not open, web browsing will not work, and HTTP communication will be blocked. Therefore, it is crucial to know how to open port 80 on various operating systems and firewalls.

Overview of the Article

This article provides a step-by-step guide to opening port 80 on a router, Windows and Linux operating systems. We will also discuss the security risks of open port 80 and the best practices for securing open ports. Lastly, we will discuss troubleshooting port 80 issues , checking if port 80 is open, and connecting to port 80.

Opening Port 80 on a Router

Opening port 80 on a router is the first step in enabling communication between devices. Here are the steps to follow:

Accessing the Router

The first step is to access the router. To do this, you need to know the IP address of your router. You can find this information in the router’s documentation or by running the “ipconfig” command in the command prompt in Windows or the “ifconfig” command in Linux.

Navigating to Port Forwarding Section

Once you have accessed the router, navigate to the port forwarding section. This section is usually located under the advanced settings or firewall settings. In this section, you will see an option to add a new port forwarding rule.

Filling out the Forwarding Form

In the port forwarding rule, you will need to fill out the forwarding form. This form will ask you to enter the port number (in this case, port 80), the IP address of the device that you want to forward the traffic to, and the protocol (TCP/UDP).

Opening Port 80 in Windows Firewall

In Windows, the built-in firewall can block incoming traffic on port 80. Here are the steps to follow to open port 80 in Windows Firewall:

Accessing Control Panel

The first step is to access the Control Panel. You can do this by clicking on the Start button and typing “Control Panel” in the search bar.

Selecting Windows Firewall

Once you have accessed the Control Panel, select the “Windows Firewall” option.

Selecting Advanced Settings

In the Windows Firewall window, select the “Advanced settings” option.

Adding Port 80 in Inbound Rules

In the Advanced Settings window, select the “Inbound Rules” option. Then, click on the “New Rule” button to create a new inbound rule. In the new inbound rule wizard, select the “Port” option, and then select “TCP” and enter port number 80. Follow the prompts to complete the wizard.

Opening Port 80 in Linux

In Linux, you can open port 80 by using the appropriate command or modifying the server.properties file. Here’s how:

Using the Appropriate Command

To open port 80 in Linux using the command line, you need to use the “iptables” command. Here’s the command you need to run:

sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT 

Modifying the server.properties File

If you are running a web server on your Linux machine, you can open port 80 by modifying the server.properties file. Here are the steps to follow:

1. Open the server.properties file using a text editor.
2. Find the line that says “server-port=” and change the value to 80.
3. Save the file and restart the web server.

Security Risks of Open Port 80

Opening port 80 can pose security risks, as it enables communication over an unencrypted channel. Here are some of the security risks:

Serving Requests over an Unencrypted Channel

When port 80 is open, all HTTP communication is transmitted over an unencrypted channel. This means that anyone who intercepts the traffic can read the data, including sensitive information like passwords and credit card numbers.

Best Practices for Securing Open Ports

To mitigate the security risks of open port 80, it is essential to follow best practices for securing open ports. Here are some of the best practices:

Using Encryption Protocols

Enabling HTTPS encryption can secure web traffic and prevent data interception. HTTPS uses SSL/TLS certificates to encrypt web traffic, making it unreadable to anyone who intercepts it.

Using Firewalls

Firewalls can protect against unauthorized access to open ports. By configuring firewall rules, you can control which traffic is allowed to enter and leave your network.

Using Virtual Private Networks (VPNs)

VPNs can secure network traffic and access open ports remotely. By using a VPN, you can encrypt your web traffic and access your network securely from anywhere in the world.

Using Port Scanners

Port scanners can detect open ports and vulnerabilities in network security. By running a port scan, you can identify which ports are open and take steps to secure them.

Using Load Balancing

Load balancing can distribute web traffic across multiple servers, preventing overloading and ensuring that the network runs smoothly.

Using Reverse Proxy Servers

Reverse proxy servers can protect web servers from direct exposure to the internet. By using a reverse proxy server, you can control which traffic is allowed to enter and leave your network, reducing the risk of data interception.

Using Secure Coding Practices

Secure Coding Practices can prevent web application vulnerabilities. By following coding best practices, you can minimize the risk of security vulnerabilities in your web applications.

Using Monitoring Tools

Monitoring tools can detect and prevent suspicious activity on open ports. By using monitoring tools, you can identify potential security threats and take steps to prevent them.

Troubleshooting Port 80 Issues

If you encounter issues with port 80, here are some troubleshooting steps to follow:

Checking for Proxy Settings

If you are using a proxy server, this may be blocking port 80. Try disabling the proxy settings to see if this resolves the issue.

Checking for Caching Proxy Servers

If you are using a caching proxy server , this may be caching old DNS records. Try clearing the cache to see if this resolves the issue.

Checking for Firewalls

Firewalls can sometimes block port 80. Check your firewall settings to ensure that port 80 is open.

Checking if Port 80 is Open

To check if port 80 is open, you can use the command window and enter “netstat -ano”. This will give you a list of active connections, and you can check to see if port 80 is listed.

Connecting to Port 80

To connect to port 80, simply type a name in the address bar of your web browser (e.g., www.example.com) and press enter. This will initiate HTTP communication with the server.

Best Practices for Securing Open Ports

To summarize, here are the best practices for securing open ports, including port 80:

• Use encryption protocols to secure web traffic
• Use firewalls to protect against unauthorized access to open ports
• Use VPNs to secure network traffic and access open ports remotely
• Use port scanners to detect open ports and vulnerabilities in network security
• Use load balancing to distribute web traffic across multiple servers and prevent overloading
• Use reverse proxy servers to protect web servers from direct exposure to the internet
• Use secure coding practices to prevent web application vulnerabilities
• Use monitoring tools to detect and prevent suspicious activity on open ports

Other code examples for opening Port 80

Port 80 is one of the most commonly used port numbers in the Transmission Control Protocol (TCP) suite. Any Web/HTTP client, such as a Web browser, uses port 80 to send and receive requested Web pages from a HTTP server. It manages all HTTP-based requests that originate from a computer, regardless of the number of requests and initiating Web clients. Similarly, the HTTP server responds to all requests received at port 80.

You don't need to put it in urls ipexample:portName

Conclusion

In conclusion, opening port 80 is essential for enabling web browsing and communication between devices. However, it also poses security risks, so it is crucial to follow best practices for securing open ports. By using encryption protocols, firewalls, VPNs, and monitoring tools, users can prevent security risks and ensure their network is safe and secure. Remember to troubleshoot issues if they occur and always follow best practices for securing open ports.

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