- Next, right-click on the network adapter > Click on Update driver.
- Select Search automatically for driver updates.
- If the update is available, it will automatically download and install the update.
- Once done, restart your PC to apply changes and check whether the Server Disconnection error on Black Ops 4 appears again or not.
But if in case, you’ve recently updated your networking driver and then the particular error in-game starts appearing that means there is some issue in the latest driver. So, it’s better to rollback the driver version to its previous version.
- Press the Windows key on the keyboard to open up the Start menu.
- Now, type Device Manager and click on it from the search result.
- Click on the Network adapters arrow icon to expand the list.

- Next, right-click on the network adapter > Click on Properties.
- Under the Driver tab, click on Roll Back Driver.

- Click on Yes to confirm the rollback driver restoration process.
- Wait for it to complete > Click on OK and restart the computer.
3. Change DNS Server
- Click on Start > Go to Settings.
- Select Network & Internet.
- Click on Network and Sharing Center.
- Click on Change adapter settings > Right-click on your active/connected internet network.
- Select Properties > Under the Networking tab, double-click on the Internet Protocol Version 4 (TCP/IPv4).
- Click on Use the following DNS server addresses > Input 1.1.1.1 for the Preferred DNS server and 1.0.1.0 for the Alternate DNS server.
- Finally, click on OK to save changes and restart the PC.
Now, you should be able to run your Black Ops 4 game via the Blizzard launcher easily and we assume that the Server Disconnection error on Black Ops 4 won’t appear again. However, if in case, this method also doesn’t work for you, try the following one.
4. Use a VPN Service
If in case, your ISP is being rejected by the Blizzard servers due to some unknown reasons and other online games from a different server are running well, that means there is some conflicting issue between Blizzard servers and your ISP (Internet Service Provider). Therefore, using a VPN service to change the region will definitely fix this out.
We’ll recommend you to use any cheapest and reliable VPN service to deal with this server region issue. However, if using the VPN also not working for you then you should contact Activision Support or Blizzard Support.
That’s it, guys. We hope you’ve found this guide useful. You can comment below for additional queries.