[Solved] How to set up when “communication error” occurs in Monster Hunter Wilds/Cannot participate in multiplayer

In this article, we will explain the settings that you should check first when you cannot participate in multiplayer, in a way that even those without specialized knowledge can understand.

Common symptoms (be careful if applicable)

• “Unable to join session” is displayed
• Cannot enter only specific friend’s rooms
• If you become the host, no one will come in
• An error code (such as XXXX) appears

These are most likely caused by NAT type or router settings.

Confirmation 1: Check the NAT type (most important)

The first thing you should check is the network status called
NAT type.

What is NAT type?

Simply put,

“Is it easy to communicate directly with others?”

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You can check from the network settings screen of your game console or PC.

Examples of displayed NAT types

• Type 1 (A): Best (almost no problems)
• Type 2 (B): Good (comfortable to play)
• Type 3 (C/D): Limited (frequent errors)

Importantポイント

• If type 3 (C/D), multi-participation is extremely unstable
• Cannot enter the room/can be a cause of not being able to enter

👉 What you should aim for is “Type 2 (B)” or higher.

Confirmation ②: Turn on UPnP

The next thing you want to check is the
UPnP (Universal Plug and Play) settings of your router.

What is UPnP?

It sounds complicated, but the role is simple.

A feature that allows the router to automatically open the communication ports necessary for the game

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Monster Hunter multiplayer uses
a method in which players communicate directly with each other (P2P communication).

If UPnP is off,

• Communication is not working
• NAT type does not improve
• Errors occur frequently

Problems like this are more likely to occur.

Setting method (roughly)

1. Open a browser on your PC or smartphone
2. In the address bar

1. Enter 192.168.0.1 192.168.1.1 etc.
2. Log in to the router settings screen
3. Find the “UPnP” item and turn it on

* The notation may differ slightly depending on the router manufacturer.

Confirmation 3: Use wired LAN rather than Wi-Fi

Even if the settings are correct,
The Wi-Fi (wireless) connection itself may be unstable.

In particular,

• Distance from router
• Between walls and floors
• Family members watching videos at the same time

In such an environment,
An error may occur due to a momentary communication interruption.

The solution is simple

• Using a wired LAN cable

That’s all.

Wired LAN

• Communication is stable
• Reduced delays and disconnections
• NAT type may be improved

There are only benefits.

And you can buy a LAN cable for
around 1,000 yen.

👉 This is the most cost effective improvement measure.

Check if that doesn’t work

• Restart your router
• Restart the modem (line termination device)
• Check if you have a dual router

Especially if you use “line and Wi-Fi router” separately,
The NAT type may be deteriorated due to dual routers.

Summary: Most communication errors are problems at home

If a communication error occurs in Monster Hunter Wilds,

1. Is the NAT type set to 3 (C/D)?
2. Is UPnP turned off
3. Can I use wired LAN instead of Wi-Fi

If you just check these three points,
many cases can be solved surprisingly easily.

Before giving up and thinking that the server is bad,
Please take a look at your home network settings.

You can now enjoy hunting with your friends without stress.