How to Fix Arma Reforger Internal Error When Connecting to a Server

When attempting to connect to an Arma Reforger server, you might encounter an “Internal error has occurred”message, along with “Session error”displayed prominently at the top. The message further explains that the kick cause code is group=1 ‘REPLICATION’, reason=1 ‘SYSTEM_FAILURE’. For more details, check the console log.

This Internal error can arise due to several factors such as overloaded game servers, incorrectly configured network settings, conflicting mods, insufficient permissions, an outdated network driver, or an inactive BattlEye Service.

To resolve the issue, consider connecting to a different server, disabling any active VPNs, restarting your PC, or switching to a wired Ethernet connection or mobile data via hotspot. For many players, these basic troubleshooting steps should help fix the Arma Reforger Internal Error on PC.

How can I fix the Internal error has occurred in Arma Reforger?

Tip

While the solutions outlined here are tailored for PC, similar steps can effectively resolve the Arma Reforger Internal Error on Xbox. On the Xbox console, make sure to clear accumulated cache and reset your network settings.

1. Use a VPN solution

One of the simplest fixes for the Arma Reforger Internal Error while playing multiplayer games is to utilize a reputable VPN service!

A VPN can help bypass localized or network-related issues, granting you seamless access to the game’s servers.

2. Run Arma Reforger as an administrator

1. Right-click on the Arma Reforger launcher (.exe file), and select Properties.
2. Navigate to the Compatibility tab, and check the box labeled Run this program as an administrator.
3. Click on Apply and then OK to save your changes. Relaunch Arma Reforger and check if the issue persists.

3. Delete the installed mods/add-ons

In approximately 60% of cases, installed mods/add-ons were responsible for the Internal error has occurred in Arma Reforger. You can take two approaches here:

• Delete all mods: Remove all installed mods/add-ons before attempting to join a server. Once you successfully connect, you can reinstall them.
• Identify the conflicting mod: Disable or uninstall all mods, then re-enable them one at a time. When the Internal error message reappears, the last mod enabled is likely causing the conflict, and you can remove it safely.

4. Update the network drivers

1. Press Windows + X to open the Power User menu, then select Device Manager.
2. Expand the Network adapters section, right-click on your active adapter, and choose Update driver.
3. Click on Search automatically for drivers and wait for Windows to install the optimal locally available version.
4. Reboot your PC to apply the updates.

If you’re experiencing the Arma Reforger Internal error on Windows due to issues with your network adapter, updating the driver should resolve the problem!

If Windows cannot find a better version, visit the manufacturer’s website to look for the latest driver and install it manually.

5. Set the BattlEye Service to automatic

1. Press Windows + R to open Run, type in services.msc, and hit Enter.
2. Scroll down, right-click on the BattlEye Service, and select Properties.
3. From the Startup type dropdown menu, choose Automatic. If the service isn’t running, click Start under Service status.
4. Click on Apply and OK to save your changes. Relaunch Arma Reforger and check if the Internal Error persists.

6. Verify the integrity of game files

1. Open Steam, navigate to your game Library, right-click on Arma Reforger, and select Properties.
2. Go to the Installed Files tab, then click on Verify integrity of game files.
3. Relaunch Arma Reforger and see if the issue has been resolved.

7. Whitelist Arma Reforger in your firewall

1. Press Windows + S to open Search, type Allow an app through Windows Firewall, and select the relevant result.
2. Click on Change settings.
3. Then click on Allow another app at the bottom.
4. Click on Browse.
5. Navigate to the location where Arma Reforger’s launcher is stored, select it, and then click Open.
6. Click on Add.
7. Ensure both the Private and Public checkboxes are checked next to Arma Reforger’s launcher, then click on OK to save your settings.
8. Lastly, reboot your computer, then relaunch Arma Reforger, and the Internal error should no longer appear.

If your firewall is blocking Arma Reforger, you’ll need to whitelist it either in Windows Defender Firewall or any third-party firewall software on your PC. Additionally, some users recommend opening specific ports in their firewall settings, but it’s wise to proceed with caution due to potential security risks!

If you have any questions or would like to share which solution worked for you, please leave a comment below.

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