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Port Test allows you to see if a TCP port on your computer is accessible over the Internet. Many programs and services require you to have open ports to use them properly, for example BitTorrent clients and FTP servers.

For Port Test to determine if your TCP port is open there must be an active listener, i.e. the program/service you are opening ports for must be running. If a port is inacccessible it is usually either a firewall

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Port Test allows you to see if a TCP port on your computer is accessible over the Internet. Many programs and services require you to have open ports to use them properly, for example BitTorrent clients and FTP servers.

For Port Test to determine if your TCP port is open there must be an active listener, i.e. the program/service you are opening ports for must be running. If a port is inaccessible it is usually either a firewall setting or an ISP restriction.

Once it is established that the port you are trying to access is closed there are multiple courses of action to open them. If your PC is behind a router and the router's firewall is disabling access to that particular port you will need to create an exception in the router's firewall settings. How to do this depends heavily of the model of router you own, however usually this requires you to access the router's configuration page in your web browser. Usually this is accessed by going to and address similar to http://192.168.0.1/, http://10.0.0.1/, etc.

Another reason for blocked ports can be the personal firewall settings on your PC. If you are using a third-party firewall application instructions to unblock ports should be available on the software manufacturers website or in the help window of the application.

Port Test was originally released in March 2011. Port Test can be accessed from http://porttest.net as well as http://porttest.io.

FAQ

Why are you hacking me?

If you are running a firewall that detects and alerts potential attacks you may be notified of an attack after using PortTest. This is not due to PortTest hacking you but seeing if your TCP ports are open, as you requested. Please do not be alarmed.

What port do I need to open for Bit Torrent?

The port that you need to open completely depends on your Bit Torrent client and your current configuration. Please see your Bit Torrent client's settings to find the TCP port you need to test.

How do I configure the firewall in Windows XP?

Please see https://support.microsoft.com/en-us/kb/841549 on opening ports under Windows XP.

How do I configure the firewall in Windows Vista?

Please see http://windows.microsoft.com/en-us/windows-vista/Open-a-port-in-Windows-Firewall on opening ports under Windows Vista.

How do I configure the firewall in Windows 7?

Please see http://windows.microsoft.com/en-us/windows7/open-a-port-in-windows-firewall on opening ports under Windows 7.

How do I configure the firewall in Windows 8?

Please see http://windows.microsoft.com/en-us/windows/open-port-windows-firewall on opening ports under Windows 8.

How do I configure the firewall in Windows 10?

Please see http://windows.microsoft.com/en-us/windows/open-port-windows-firewall on opening ports under Windows 10.

How do I open ports in Norton Internet Security 2012?

Open Norton Internet Security 2012 and go to Settings -> Network -> Smart Firewall -> Advanced Settings -> Configure -> General Rules -> Configure -> Add as an Administrator. Add the particular TCP ports you wish to open.

How do I open ports in Norton 360?

Open up Norton 360 and go to Settings > Network > Smart Firewall > Program Fules > Configure. Find the application you are trying to open the port for in the list and click the "Access" drop-down to the right. Select "Custom" from the drop-down. Go to the "Communications" tab and select "TCP and UDP" under protocol and click "The rule will apply only if it matches all of the ports listed below". Under "Ports" click "Add" and input your port number.

How do I open ports using UFW?

If you are running linux and use UFW you can open a port by simply running "sudo ufw allow 53".

How do I open ports in my iptables?

If you are running linux and want to open up a particular port in you iptables please see the following website: https://help.ubuntu.com/community/IptablesHowTo.

Common Ports

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