Solved: How do I fix “Unable to join game session” notice with BAMBERGA status on Call of Duty: Infinite Warfare?

Problem: Having issue when try to join friends’ zombies game in the custom match or gameplay is paused, got the exit notice show “Unable to join game session” with BAMBERGA status. This error message is reported to happen on both consoles (PS4, Xbox One) and PC.

Follow below solution steps to resolve “Unable to join game session” issue.

Content Summary

Potential Causes
Solution 1: Restart the Game
Solution 2: Enable UPnP (Universal Plug and Play) in Router Settings
Solution 3: Fix NAT on PC
Solution 4: Port Forwarding
Reference

Potential Causes

This looks like a NAT issue which can cause this type of error. Call of Duty has specific ports that need to be open to allow for the best multiplayer experience. Follow below solution steps to resolve “Unable to join game session” issue.

Solution 1: Restart the Game

Quit the game completely, wait for a few seconds, then launch it again.

Solution 2: Enable UPnP (Universal Plug and Play) in Router Settings

* Steps may be vary depending on the router’s manufacturer.
Step 1: Open the browser and access to Router configuration page, normally the default address is 192.168.0.1 or 192.168.1.1

Step 2: Log in to the router configuration page. You should be able to login using admin for both username and password if you never changed the default login credentials. If that doesn’t work then search online for specific steps on accessing your router default admin login credential.

Step 3: Look for the UPnP setting in WAN Internet Connection or Forwarding tab in the Router configuration page.

Step 4: Enable UPnP setting.

Step 5: Save the changes and restart the router and PC.

Solution 3: Fix NAT on PC

Step 1: Press Windows key + R to open the Run box.

Step 2: Type ms-settings:gaming-xboxnetworking and press Enter to open the Xbox Networking tab of the Gaming Settings app.

Step 3: Check the NAT Type. If the NAT Type shows Closed or Teredo is unable to qualify, then click the Fix it button to fix the issue automatically.

Solution 4: Port Forwarding

* Steps may be vary depending on the router’s manufacturer.
Step 1: Open the browser and access to Router configuration page, normally the default address is 192.168.0.1 or 192.168.1.1

Step 2: Log in to the router configuration page. You should be able to login using admin for both username and password if you never changed the default login credentials.

Step 3: Expand the Advanced menu and access the NAT Forwarding or WAN – Virtual Server / Port Forwarding section.

Step 4: Click on Virtual Servers and Add button to begin the process of adding port.

List of the port to open for Call of Duty Infinite warfare:
PC
TCP: 3074, 27015-27030, 27036-27037
UDP: 3074, 4380, 27000-27036

Playstation 4
TCP: 80, 443, 1935, 3074, 3478-3480
UDP: 3074, 3478-3479

Xbox One
TCP: 53, 80, 3074
UDP: 53, 88, 500, 3074, 3076, 3544, 4500
Step 5: Restart both router and the console/PC.

Reference:

Activision Support > Port Forward and NAT FAQ > An overview of port forwarding and NAT settings
Steam > Call of Duty: Infinite Warfare
Xbox User Forums > XBoX Games and Apps > bamberga
Microsoft Community > bamberga x box one.. HELP