Hey SpeciousDennis! This error can occur for a couple different reasons - if temporary files on your Xbox 360 console are corrupted, or if you need to open network ports. To troubleshoot, can I have you try the following steps:
Solution 1: Clear your system cache
If you still get status code 80072746, try the next solution.
Solution 2: Clear your Marketplace system cache
The Xbox 360 console also stores temporary files for Xbox LIVE Marketplace. Clearing the Marketplace cache may fix this problem. Follow these steps:
- On your console, go to My Xbox, and select System Settings.
- Select Memory, and then select your primary storage device.
- Select System Items.
- Select Marketplace System Data.
- Select Delete.
- Restart your console.
- Try to access Xbox LIVE Marketplace.
- If you still get status code 80072746, try the next solution.
Solution 3: Open network ports
If you have a firewall or are connected to a network through your workplace or school, you might need to open network ports in order for your Xbox 360 console to communicate with Xbox LIVE. See
Network ports used by Xbox LIVE for help with opening network ports.
Let us know how these steps go!