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Error Message: A Communication Error Occurred. Returning to the Main Menu.

Nintendo Switch 2, Nintendo Switch, Nintendo Switch Lite, Nintendo Switch - OLED Model

Information to help you when, while you're attempting to play Tetris 99 on Nintendo Switch 2 or Nintendo Switch, the following error message and/or error codes are displayed:

  • "A Communication Error Occurred. Returning to the Main Menu."
  • Error code: 2-ARZNA-0001 to 2-ARZNA-0009.

Before you start

You will need:

  • Your Nintendo Switch 2 or Nintendo Switch console
  • An Internet connection

Possible solutions

Are you using a Wireless or Wired Internet connection?

  • Wireless
    • Restart the console.
    • Manually enter an alternate DNS.
      • How to manually enter DNS settings on Nintendo Switch 2 or Nintendo Switch
        1. Select Settings from the HOME Menu.
        2. Select Internet.
        3. Select Internet Settings. Your console will automatically search for nearby Wi-Fi signals.
        4. Select your network from the list of networks located under Saved Networks on Nintendo Switch 2 or Registered Networks on Nintendo Switch.
        5. Select Change Settings.
        6. Select DNS Settings.
        7. Select Manual.
        8. Select Primary DNS.
        9. Hold down the B Button to delete the existing DNS (it defaults to zeros).
        10. Enter 8.8.8.8 as the primary DNS, and then select OK.

          Important: The suggested DNS are public DNS provided by Google and are subject to Google's Terms of Service. If you prefer to not use this service, doing an Internet search for public DNS will provide you with several other options you can use.

        11. Select Secondary DNS.
        12. Hold down the B Button to delete the existing DNS.
        13. Enter 8.8.4.4 as the secondary DNS, and then select OK.

        For more information, see How to Manually Enter DNS Settings on Nintendo Switch 2 or Nintendo Switch.

    • Move the console within 10 to 15 feet of the wireless router to improve the signal strength during troubleshooting.
      • If you haven't already, it may be helpful to remove the console from the dock while troubleshooting, and then return the console when troubleshooting is complete.
    • Power cycle your home network.
      • How to power cycle your home network
        1. Unplug the power cable from both the modem and wireless router (if separate from the modem).
        2. If the modem's lights remain on, this may indicate you have a back-up battery installed. You will need to remove this battery to power cycle the modem.
        3. After 30 seconds, plug the power cable back into your modem and wait for the lights to remain steady.
        4. Plug the power cable back into the router and wait for the router lights to remain steady.

        For more information, see How to Power Cycle a Home Network.

    • If you have any filing cabinets, speakers, power strips, glass, or cordless phones, next to your system or wireless router, move them away.
    • If supported by your router, connect to a different wireless band
      • How to connect Nintendo Switch 2 to a different wireless band
        1. Select Settings from the HOME MenuThe System Settings icon highlighted on the HOME Menu on Nintendo Switch 2.
        2. Select Internet, and then Internet Settings Internet page highlighted in the System Settings on Nintendo Switch 2. The console will automatically search for near-by Wi-Fi signals.
        3. Select the network name (SSID) of the frequency band you are not currently connected to. Many routers will have default SSID names that label whether the connection is 2.4Ghz or 5Ghz.
        4. If prompted, use the onscreen keyboard to enter the network's wireless passwordEntering wireless network password using on-screen keyboard in the System Settings on Nintendo Switch 2.
        5. The console will test the Internet connection. Once the test is complete, select OK to complete the process.

        For more information, see How to Connect to the Internet on Nintendo Switch 2.

      • How to connect Nintendo Switch to a different wireless band
        1. Select Settings from the HOME Menu System Settings icon highlighted on the HOME Menu Screen.
        2. Select Internet, and then Internet Settings Internet is selected on the System Settings menu on the Nintendo Switch. The Nintendo Switch will automatically search for near-by Wi-Fi signals.
        3. Select the network name (SSID) of the frequency band you are not currently connected to. Many routers will have default SSID names that label whether the connection is 2.4Ghz or 5Ghz.
        4. If prompted, use the onscreen keyboard to enter the network's wireless password Onscreen keyboard displayed when a network's wireless password is required.
        5. The Nintendo Switch will test the Internet connection. Once the test is complete, select OK to complete the process.

        For more information, see How to Connect a Nintendo Switch Console to the Internet Using a Wireless Network.

  • Wired
    • Restart the console.
    • Power cycle your home network.
      • How to power cycle your home network
        1. Unplug the power cable from both the modem and wireless router (if separate from the modem).
        2. If the modem's lights remain on, this may indicate you have a back-up battery installed. You will need to remove this battery to power cycle the modem.
        3. After 30 seconds, plug the power cable back into your modem and wait for the lights to remain steady.
        4. Plug the power cable back into the router and wait for the router lights to remain steady.

        For more information, see How to Power Cycle a Home Network.

    • Manually enter an alternate DNS.
      • How to manually enter DNS settings on Nintendo Switch 2 or Nintendo Switch
        1. Select Settings from the HOME Menu.
        2. Select Internet.
        3. Select Internet Settings. Your console will automatically search for nearby Wi-Fi signals.
        4. Select your network from the list of networks located under Saved Networks on Nintendo Switch 2 or Registered Networks on Nintendo Switch.
        5. Select Change Settings.
        6. Select DNS Settings.
        7. Select Manual.
        8. Select Primary DNS.
        9. Hold down the B Button to delete the existing DNS (it defaults to zeros).
        10. Enter 8.8.8.8 as the primary DNS, and then select OK.

          Important: The suggested DNS are public DNS provided by Google and are subject to Google's Terms of Service. If you prefer to not use this service, doing an Internet search for public DNS will provide you with several other options you can use.

        11. Select Secondary DNS.
        12. Hold down the B Button to delete the existing DNS.
        13. Enter 8.8.4.4 as the secondary DNS, and then select OK.

        For more information, see How to Manually Enter DNS Settings on Nintendo Switch 2 or Nintendo Switch.

    • Check that other devices on the network have access to the Internet. Try to connect online through the network with a device that has an Internet browser, and test to check if you are able to browse the Internet. If other devices cannot connect online, the network itself may not have access to the Internet. If this occurs, contact your ISP or network administrator.

Situation not resolved

If you are still unable to connect, this may indicate an issue related to the network environment or router being used.

If you would like to continue troubleshooting potential issues related to the router, contact the router's manufacturer for assistance with performing the following steps:

  • Updating the router's firmware
  • Resetting the router back to its factory default settings

If you would like further assistance with your console, please contact us for additional support.

Additional information

  • This error message and error codes may indicate an issue with the DNS used, or that the connection timed out.
  • These errors may be the result of a slow Internet connection, wireless interference, or a weak wireless signal from the router.

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