Troubles with updating my ipod touch

hi, when i try to update my ipod touch, it comes up with this message: http://prntscr.com/1ac3hf
im really stuck on what it means and how i can fix it?

Update Server
Try:
- Powering off and then back on your router.
- iTunes for Windows: iTunes cannot contact the iPhone, iPad, or iPod software update server
- Change the DNS to either Google's or Open DNS servers
Public DNS — Google Developers
OpenDNS IP Addresses
- Try on another computer/network
- Wait if it is an Apple problem

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