Error code 21 while trying to restore my phone. what does it mean?

help

Did you already check your security software settings?
Check for hardware issues
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the alert when you update or restore, contact Apple support.
Common errors: 1, 10-47, 1002, 1011, 1012, 1014, 1000-1020.

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of following I don't know anything - but he usually 100% onto something.
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TS3694 error code 3194 when trying to restore my ipad?

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iOS: Restore error 3194 or 'This device isn't eligible for the requested build'
http://support.apple.com/kb/TS4451
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http://support.apple.com/kb/TS3694
Unable to contact the iOS software update server gs.apple.com
Error 1004, 1013, 1638, 3014, 3194: These errors may be the result of the connection to gs.apple.com being redirected or blocked. Follow these steps to resolve these errors:
1. Install the latest version of iTunes.
2. Check security software and ensure that communication to gs.apple.com is allowed. Follow these steps for assistance with security software.
3. Check the hosts file. The restore will fail if there is an active entry to redirect gs.apple.com. Follow the advanced iTunes Store troubleshooting steps to edit the hosts file or revert to a default hosts file. See "Blocked by configuration: (Mac OS X/Windows) > Rebuild network information."
4. Try to restore from another known-good computer and network.
5. If the errors persist on another computer, the device may need service.
Thanks,
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Error code 21 while trying to restore my phone. what does it mean?

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