HT201210 I have tried to update my iPhone 4 many times (from iOS 5.1 to latest version), but everytime it fails and says that it cannot be updated. unknown error (3194). please help.

I have tried to update my iPhone 4 many times (from iOS 5.1 to latest version), but everytime it fails and says that it cannot be updated. unknown error (3194). please help.
<E-mail Edited by Host>

You might try reading the entire help document you linked from:
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:
Install the latest version of iTunes.
Check security software. Ensure that communication to gs.apple.com is allowed. Follow this article for assistance with security software. iTunes for Windows: Troubleshooting security software issues.
Check the hosts file. The restore will fail if there is an active entry to redirect gs.apple.com. FollowiTunes: Advanced iTunes Store troubleshooting to edit the hosts file or revert to a default hosts file. See section "Blocked by configuration: (Mac OS X/Windows) > Rebuild network information".
Try to restore from another known-good computer and network.
If the errors persist on another computer, the device may need service.

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