Players using the PS4 platform to play games often report getting an error message “PS4 NAT Type Failed”. This problem usually arises when you cannot hear the other person in the chat and find that you do not have the proper internet settings saved on your console.. 
This problem is very generic. We will do the necessary tests to fix this problem and it will only work “and” the problem is on our side. We will change the settings of PS4 and your router. If this doesn't work, there is not much you can do except contact your ISP and inform them of your situation.
before continuing, make sure your network is working perfectly, namely, that can access the internet. You can use another device to make sure of this.
What are the types of NAT?
NAT (abbreviation for network address translation), represents the ability to translate a public IP address to a private IP address. With this mechanism, ISPs assign a public IP to several hundred clients at the same time. When the packages go out, they are assigned the public IP but a different port number. When a package arrives, the public IP is replaced by the private IP present on the network and the port numbers are changed accordingly. A table of NAT addresses is present in the NAT device to perform the conversion. The same procedure is being carried out with your home routers. There are three types of NAT present:
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Open (Kind 1): Here the system is directly connected to the Internet (there are no routers or firewalls between them). With this, you should probably have no problem connecting to other PS4 systems.
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Moderate (Kind 2): The system is connected to the router and in most cases you shouldn't have any problems.
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Strict (kind 3): the system is connected via a router with no established DMZ configuration or open ports. You may have problems with your connection or voice chat.
The error “PS4 NAT type failed” usually triggered due to incorrect network settings or the network firewall causing the problem. Changing the NAT type is one of the effective solutions to solve this behavior. We will try this using the router settings.
Follow the solutions above and work accordingly.
Solution 1: manually configure PS4 network settings
Sometimes, PS4 NAT error may be due to wrong network settings saved on your console. You need to check the IP address of your PS4 and see if it is assigned correctly or has been changed correctly. To verify the IP address, do the following:
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Navigate to the main screen of your PS4 and open your Settings. Once in Settings, click on the Network sub-category.
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Now click on the option »View connection status«.
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The IP address assigned to the PS4 console will be listed here.
If your console doesn't have the correct settings already set, we can try to adjust it manually. Here's a twist; you need a computer that is on the same network as your PS4. We will use that computer to check the internet connection details and then enter the same details on your PS4.
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In the computer (which is connected to the same network as the PS4), press windows + R, scribe “cmd” and press Enter. Once on the command line, run the following command:
ipconfig /all
You will get all the information about all the network interfaces of your computer. Choose the correct one (the one connected to the same network as the PS4) and see all the details here. We will present them later.
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Now turn on your console and go to Settings> Red> Set up the internet connection
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You will be given the option to select the connection medium from which you want to connect your PS4 to the Internet. Select the appropriate one and continue.
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In the next menu, select »Custom«. How are we going to add the information manually?, we will use custom.
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Since we are not using the proxy server, we will not select it in the next option.
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After entering the necessary details, test the connection. Here, as you can see, your NAT type is 2. Check if the problem is solved and if you can access and operate all modules as expected.
Solution 2: habilite Universal Plug and Play (UPnP) on the router
NAT enabled devices have the solution of using UPnP on the router to automatically configure the NAT table and perform all the necessary mechanics automatically. It is a set of network protocols that enables networked devices to seamlessly discover each other's presence on the Internet and also establish functional network services for data services.. We need to enable this option on your router and see if this works.
Note: note that you will need the credentials of the network router present in your house. As usual, are printed on the back of the router or in the box. If they haven't been changed, the default username is “admin” and the default password is “admin”.
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Go to your router. To start the session, you must enter the IP address associated with the router that also appears on the back or on its box. The IP should look like $ 0027 192.168.1.1 $ 0027 O $ 0027 192.168.8.1 $ 0027, etc. Enter the necessary data and get access.
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Now navigate to the UPnP menu and enable the service. Each router has its own arrangement of settings, so you have to look at them or consult the manual to find their location.
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Now save the changes and the power cycle of both devices. After turning them back on, check your PS4's internet connection and see if the correct NAT type is now selected.
Solution 3: enable DMZ server (demilitarized zone)
As the problem is mainly related to connecting and discovering various devices on the internet, we try to use UPnP. If that doesn't work, we can try to configure a DMZ. The DMZ is a logical or physical subnet that exposes the external services of a network to an untrusted network. This unreliable network is the Internet. We will use your PS4 as your DMZ host.
This will mainly help to correct the network settings of your router and help to establish good connections between the consoles.. There is not much “that” of a security threat. Go ahead and see if this method works.
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Navigate to your PS4's network settings and make a note of the IP address.
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Go to your router. To start the session, you must enter the IP address associated with the router that also appears on the back or on its box. The IP should look like $ 0027 192.168.1.1 $ 0027 O $ 0027 192.168.8.1 $ 0027, etc. Enter the necessary data and get access.
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Now open your router's DMZ menu. This menu can be present in the NAT subcategory or in forwarding. As mentioned earlier, the layout is a router different from the router.
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Enter the IP address of the PS4 here and apply the changes.
advice: if you are using routers that have the NAT filtering option, etc., you can also enable open NAT filtering.
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Save all your changes and exit. Now power cycle all modules (PS4 and your router). After turning on the console, check the internet connection status. Hopefully, this will solve the problem.
Solution 4: port forwarding for your network
Port forwarding is the act of redirecting a communication request from one address and port number combination to another while packets are passing through a network gateway., like a router. This technique is widely used to make the services of one host on a protected network available to the hosts on the other side of the gateway..
Sony has already listed a number of ports for me to forward. We can try to do it and see if this fixes the problem.
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Go to your router. To start the session, you must enter the IP address associated with the router that also appears on the back or on its box. The IP should look like $ 0027 192.168.1.1 $ 0027 O $ 0027 192.168.8.1 $ 0027, etc. Enter the necessary data and get access.
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Now navigate to Port Forwarding Before proceeding to add the ports in the forwarding table, It is recommended that you ensure that your PS4 has a name and IP address assigned to each of these ports.
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Now add the following ports in your router's port forwarding table:
80(TCP), 443(TCP), 3478(TCP y UDP), 3479(TCP y UDP), 3480(TCP)
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After making the necessary changes, save your progress and power cycle. Now check your internet connection on your PS4 and see if the problem at hand is fixed.
