HT201274 trying to restore my iphone 5. i keep getting error 21. i tried on 5 different computers

I am trying to restore my iphone 5. I keep getting error 21. I have tried on several computers . What do I do?

Either your antivirus/firewall is blocking access to Apple's servers, or all of those computers you tried have been used to hack or jailbreak some iOS device in the past.

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