Please let us know the platform you are on and how long you have been unable to connect. You can always check the status of online services here Call of Duty®: Ghosts || Game Status .
If you are still experiencing this issue, here are some tips you may want to try.
You can always check online services status here http://www.callofduty.com/ghosts/status
If online services are fully operational and you are still unable to connect, you may want to try the following.
- Reboot your router.
- Try using a wired connection in order to sustain the connection quality.
- To help identify if there is an issue with the router or blocked ports, try connecting directly through the modem.
- Check the NAT type. Is it Open, Moderate or Strict?
- Establish a static IP address and port forward.
Here are the port numbers you will need:
Xbox: Activision Support
Should you have any questions on how to port forward, please contact your ISP or the router manufacturer.