So, if you’re facing issues overall connecting to the network, you should fix that first in order to proceed further. If everything looks fine and yet the iTunes error 0x80090318 pops out, you can follow these instructions to fix it.
Note: The error could also be caused because of the improper configuration of Time and Date; check that too.
Network reset will solve the issue if the network is the cause of it. Hence to do a network reset,
- Open CMD as admin by right-clicking on the start button and clicking on Command prompt(Admin).
- Now type in “Netsh Winsock reset” and hit enter.
- Restart your PC (not manually shutting down and powering on, but a full restart).

Finally, check if you can access the iTunes store without the iTunes error code 0x80090318 popping.
Solution 3: Disable anti-virus and firewall
As you know, the firewall helps to protect us against unwanted network attacks. Hence in our case, a poorly configured Anti-malware or Firewall software may be blocking the connection.
There are many Softwares available, and the procedure will vary based on the software. But we can explain for the mainly used Windows Security software.
Note: This action is temporary, and we will be turning on protection once we solve the issue.
To temporarily disable Windows firewall:
- Click on start and type “Defender” and click on “Windows defender firewall.”
- Now click on “Turn windows defender firewall on or off.”

- Then click on Turn off for all options and hit ok.

For disabling Realtime protection on Windows security:
- Open windows security app by clicking on Start and searching for “Windows Security.”
- Now Click on Virus and threat protection, and click on manage settings.
- Now disable the realtime protection by sliding the toggle switch.

Once all conflicts are down, check if this thing solves the issue. If all things work well, add this app into the exclusion list of the Windows firewall, and this option will start to work even if the firewall is activated again. To allow an app trough windows firewall,
- Goto firewall settings, as mentioned above, and select “Allow an app or feature through windows firewall.”
- Now from the list, select the apps which you have to allow to through the firewall.
- Hit ok to save the changes.

Solution 4: Clean PC, update, and reinstall
For this problem, if it’s persisting even after trying those methods, it means something else is corrupted. Either due to a virus or a setting changed without notice. So follow these steps one by one.
- Download an Antivirus tool and perform a full system scan. If you wish you can rely on Windows Defender, it is a decent app, but many alternatives like Malwarebytes perform even better.

- Update everything from the system and app to all the devices to the latest version, and update your drivers.

- Once done, perform another system scan just in case if you’ve installed any malware in the process of updating.
- Now, if the iTunes store works fine, congratulations, if not, then reinstall the app to check if it works.
Conclusion
So to conclude this article, the iTunes 0x80090318 error can be fixed with some easy methods and solutions. But it takes time and patience.
I hope you have fixed the issue and got it working again. Although if none of the solutions work for you, I suggest you write an e-mail to the developers of the software regarding the issue with supporting info.