How to open port 8080

Different methods to open port 8080 in Debian

by Renodiya S | Apr 26, 2019

Some services like Tomcat accepts connections on port 8080.

But this port is not open by default in Debian Linux servers and can cause the service to fail during setup.

Today, we’ll take a look at how our Support Engineers configure Debian to accept connections in port 8080.

What is port 8080 used for?

Port 8080 is an alternative to port 80 and is commonly used as a proxy and caching port. It is also above the well-known service port range (1-1023).

For example, applications like Apache Tomcat, M2MLogger, and a Web GUI use port 8080 to connect to internet services.

If web address uses port 8080, it require a default port to override and connect instead of the port 80 ie., the user has to type http://localhost:8080/web.

How do I find out my port 8080 is opened?

It is simple, you can use netstat command to see if port 8080 is opened.

This command displays all connection, process Id and listening port.

Now, let’s take a look at the different methods and how we open port 8080 in Debian.

Methods to open port 8080 in Debian

There are different methods to open port in Debian.

Now, let’s see each one of them listed below.

1. Using iptables

From our experience in managing servers, we see that iptables is one of the most common ways to open port in Debian. This requires certain rules to allow and block traffic in iptables. Any wrong command can result in server unreachable.

That’s why, our Support Engineers always double check the iptables rules before saving them. And, the iptables command to open port 8080 is,

To list which ports are opened run the below command

2. Adding port in apache2

Recently one of our customers reported us with a problem to add port 8080 in apache2 where his OS is Debian 4.1.2-25.

So, to fix the problem we opened apache2/ports.conf file and added the following lines.

And also in apache2/sites-available/default file added the below line.

Then, restarted apache2 service and verified if the port is opened by running the command

3. Using UFW

Similarly, another option to open port 8080 is using UFW (Uncomplicated Firewall).

This is a user-friendly front-end for managing iptables firewall rules easier.

With UFW for an application like Tomcat to open port 8080, we execute the steps like this.

The output will look like this.

4. Using FirewallD

In addition, FirewallD is a default firewall management tool that manages the system’s iptables rules.

Opening a port 8080 in firewalld is fairly simple, you need to run the command and reload the service as shown below.

To list the ports that are opened run the below command.

[Having trouble with Debian open port 8080? We’ll fix it for you.]

Conclusion

To open port 8080 in Debian, we can use any methods like iptables, ufw, firewalld, etc. Today, we saw how our Support Engineers opened “Debian open port 8080”.

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How to open port 8080 in DigitalOcean – 3 Common issues fixed

by Sijin George | Dec 19, 2018

Hosting applications like Tomcat, Jenkins, etc. will require your DigitalOcean Droplet to allow connections on port 8080.

This requires Droplet firewall modification. At times, even after changes in firewall, the application can fail due to improper firewall set up.

At Bobcares, we help cloud server owners to configure the firewall as part of our Managed Cloud Services.

Today, we’ll see how we open port 8080 on the Droplet, common errors along with their fixes.

How to open port 8080 in Droplet?

In DigitalOcean Droplets, installing common services like web server, mail server, etc. do not need further firewall changes. That means, when the service starts, we can connect to port 80, port 25, etc.

But, that is not the case with custom ports like 8080. They need to be opened in firewall.

Firewall modifications are really critical. Any bad firewall rules can mess up the working of the entire server.

Now, let’s see how our Cloud Specialists open up the port 8080.

1. Using UFW

All DigitalOcean Droplets usually come with a firewall tool called UFW, or Uncomplicated Firewall. We’ll first see the steps to open port using UFW.

Here, before adding the rule, we first confirm that UFW is active. To see the status, we use :

When it is active, the result looks like

Now, we can open port 8080 by the command

The output on successful addition of rule will look like:

And, it shows in the rule list as:

2. Using command-line

Similarly, we often use command-line utilities to add the firewall rules in the Droplets. For this, we use the command,

This opens up the port 8080 on the server.

Common errors while opening port 8080

Although, the process of opening port 8080 looks really easy, we often get requests from customers about failure of apps on port 8080.

Let’s now have a look at the top errors that we see.

1. Server IP not listening

At times, even after adding firewall rule, the server IP may not listen on port 8080.

Here, our Support Engineers check the firewall rules and confirm that rules are added correctly. Often, the “Listen” directive of the application will have only localhost interface in it.

Therefore, to fix the problem, we edit the Listen entry of the application config file and replace ‘127.0.0.1’ as ‘0.0.0.0’. Now, the main IP also starts listening.

Again, we confirm this by telnet command. On successful connection on main server IP 165.xx.1×6.65, the results look like:

2. Application not showing in browser

Another common problem is that application do not show up in the browser. For example, the Tomcat application pages shows timeout error.

In this case, our Cloud Engineers first check and confirm the process running on port 8080 using the command,

Usually, some other program will be using that port. And, this causes Tomcat service to fail.

To fix, we check the alternate processes and kill those that shouldn’t be running. Then, we restart Tomcat service and the pages show up correctly.

3. Cannot connect on 8080

Even when the firewall rules, service configuration, etc. are correct, customers can have problems with port 8080 connection.

Most common reason for this will be firewall restrictions at user’s computer.

Here, we isolate the problem by checking the connection from an alternate location. When connection works from a new location, it clearly indicates that problem is at user’s side. Therefore, we suggest customers to tweak their home network firewall.

Conclusion

The process to open port 8080 in DigitalOcean Droplet is rather easy. However, bad firewall rules can affect connectivity to the server. Today, we saw how our Cloud Engineers open the port and correct the common problems with port 8080 connectivity.

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EC2: How to add port 8080 in security group?

I want to add port 8080 to EC2 security group to access tomcat. But whenever I select HTTP from drop down I get 80 port as default and also can’t change it.

So how can I add 8080 so that I can access Tomcat publicly?

3 Answers 3

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You have to choose «Custom TCP rule» in the dropdown.

Then you will be able to change the port to 8080.

You have to able the port in two different sections: (1) Windows firewall, as it was explained before. (2) Directly in Amazon Web Service console, exactly in security groups/inbound.

after adding the rule in security group, you should also turn on the Linux os port in order to access your webservice command for doing that

sudo ufw allow 8080/tcp

Some Extra Information: Actually this is not a good why to deploy the service. we should rather use a reverse proxy server to handle all kind of requests (like nginx), and those request should be routed to specific web service in this why whole traffic will be routed to 80 port(HTTP) or 443 (HTTPS) if you want to configure SSL. Thus a lot of things become easier by using it. Follow this to know how to use Nginx.

How To Open Firewall Ports In Windows 10

By Nathaniel Mott published 2 February 18

This tutorial was written by Tom’s Hardware Community member JamieKavanagh. You can find a list of all their tutorials here.

A firewall is an essential aspect of computing and no PC should ever be without one. That’s why Windows has one bundled and active as standard. Windows Firewall occasionally has to be told to let a program communicate with the network, which is where opening ports comes in. If you want to open firewall ports in Windows 10, here’s how you do it.

Firewalls are designed to protect a network from threats. Either threats from the outside trying to get in or threats from the inside trying to get out. It does this by blocking network-enabled ports. Every time a program tries to communicate through this port, the firewall checks its database of rules to see if it is allowed or not. If it doesn’t know, it asks you, which is why you sometimes see prompts asking you if a particular program is permitted to access the internet.

Open firewall ports in Windows 10
You can manually permit a program to access the internet by opening a firewall port. You will need to know what port it uses and the protocol to make this work.

You have now opened a firewall port in Windows 10!

Nathaniel Mott is a freelance news and features writer for Tom’s Hardware US, covering breaking news, security, and the silliest aspects of the tech industry.

How we redirect port 80 to 8080 in Apache and fix related errors

by Jilu Joseph | Sep 6, 2019

Web server listens on port 80 by default.

But for running applications like Tomcat or JBoss on the same server, we need to redirect port 80 to 8080 in Apache configuration.

However, it may not always work due to improper Apache settings and ends up in website errors.

At Bobcares, we often get requests from our customers to fix redirect port 80 to 8080 apache errors as part of our Server Management Services.

Today, this write-up describes how our Support Engineers fix Apache port redirection errors.

How to redirect port 80 to 8080 in Apache

It’s pretty easy to route Apache to another port. Let’s see how our Support Engineers route port 80 to 8080.

1. Initially, we login into the server as a root user.

2. Then, we create the file /etc/apache2/other/port8080-redirect.conf.

3. After that, we add the following code into the file and save it.

Document root may vary with server settings.

4. At last, we restart the Apache service.

In addition, this port redirection set up with Apache module mod_proxy. For this, we should enable mod_proxy on the server.

How we fixed the common errors

At Bobcares, where we have more than a decade of expertise in managing servers, we see many customers face problems while redirecting port 80 to 8080 in Apache.

Now let’s see how our Support Engineers fixed the top errors.

1. Incorrect proxy settings

Recently, one of our customers had a problem while redirecting port 80 to 8080 in Apache. He got an error when restarting the apache service after updating the rule in the apache configuration file, The error said,

It was clearly a syntax error in specifying the proxy module. So, we correctly added a line to load proxy_module in httpd.conf.

And, we ensured that the file exists with correct permissions.

Also, in the path set in DocumentRoot, we edited the links for each application in Tomcat’s web apps directory. Otherwise, the HTTP server will not be able to load resource files, like CSS and JS.

That fixed the problem and the website started working fine.

2. Wrong firewall

A common error when using custom Apache ports relates to the server firewall. Often server owners fail to open port 8080 in the server. This can cause the website to fail.

Therefore our Dedicated Engineers open port using the firewall application that the server uses. For instance, in iptables, we use:

Or when the server has Plesk control panel, we open port from admin panel at:

3. Missing Module

Similarly, customers often complaints that the port forwarding is not working on their server. They may consider that it may happen due to improper port settings in the server. However, web apps like Tomcat need a mod_proxy module that easily routing a Tomcat web app to an Apache frontend.

Therefore, our Support Engineers ensure that the mod_proxy and mod_proxy_http enabled on the server. If not we’ll enable it for the proper working of port forwarding.

[Need assistance in port forwarding and to fix related errors? We’ll help you.]

Conclusion

In short, when redirecting port 80 to 8080 in Apache, error may happen due to the improper settings in the configuration file. Today, we saw how our Support Engineers fix redirect port 80 to 8080 apache related errors.

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