Temporary Workaround: Adjusting MTU to Reduce Black Screen Issues

Temporary Workaround: Adjusting MTU to Reduce Black Screen Issues
Some players have reported black screens when changing channels, entering the Cash Shop, or logging in. Based on community testing, this appears to affect certain ISPs and regions and may be related to how network packets are handled in transit.

As a temporary workaround, some players have found success by lowering their network MTU from the default 1500 to 1400.

How to change MTU (Windows)
Step 1: Identify your network adapter name
Before running the MTU command, you will need to know the name of your active network adapter. While it is commonly named Ethernet (for cable), some systems may use names such as Ethernet 2, Ethernet 3, Wi-Fi, or Wi-Fi 4.

1. Press Start, search for PowerShell
2. Right-click Windows PowerShell
3. Select Run as administrator
4. Run the following command:

netsh interface ipv4 show subinterfaces

Example


Step 2: Set MTU to 1400
Once you have identified the correct adapter name, run the following command (replace "Ethernet" with your adapter name if different):

netsh interface ipv4 set subinterface "Ethernet" mtu=1400 store=active
or
netsh interface ipv4 set subinterface "Wi-Fi" mtu=1400 store=active

Press Enter, then restart the game client and test again.



Is this safe?
Yes, setting MTU to 1400 is a commonly used and safe value, especially on VPNs, tunneled connections, and DDoS-protected routes.
For most users, this change has no noticeable impact on other games or applications.

This change applies system-wide while active. If you feel uncomfortable or notice unexpected behavior in other applications, you are free to revert it at any time.

How to revert to default MTU
To restore the default value (1500), run the following command in PowerShell (Admin):

netsh interface ipv4 set subinterface "Ethernet" mtu=1500 store=active
or
netsh interface ipv4 set subinterface "Wi-Fi" mtu=1500 store=active

Alternatively, restarting your computer will also revert temporary MTU changes.

Making the change permanent (optional)
If you wish to keep this MTU change permanently (for example, if restarting your PC causes the issue to return), you may use the following command instead:

netsh interface ipv4 set subinterface "Ethernet" mtu=1400 store=persistent
or
netsh interface ipv4 set subinterface "Wi-Fi" mtu=1400 store=persistent



Note: This will persist across reboots.

Important notes

• This workaround is optional and only recommended if you are affected
• This is a temporary mitigation, not a confirmed permanent fix
• Staff are aware of the issue and continue to investigate it on our end

Special thanks to @Apoc_Ellipsis for identifying and sharing this workaround.

 

Additional note: if you are still facing issues despite performing the above changes, you might be facing a different issue

Please create a new thread with relevant details or screenshots if that's the case
https://royals.ms/forum/forums/technical-help.6/create-thread