what is error message 3194?

Error 3000-3999: (3002, 3004, 3013, 3014, 3164, 3194, and so on) Error codes in the 3000 range generally mean that iTunes cannot contact the gs.apple.com server on ports 80 or 443. This may be because out-of-date or incorrectly configured security or firewall software is interfering, an entry in your hosts file redirecting requests to gs.apple.com, or due to your Internet proxy settings. If you are using a proxy, try without using one or with a known-good network. If that does not resolve the issue, follow iTunes for Windows: Troubleshooting security software issues. Error 3014 may indicate that you need to free up more disk space on the computer before trying to restore again.

Possible causes: Firwall/Antivirus (Kaspersky particularly), router blocking the port or address, or, if you have ever used a program to hack your phone such as tinyumbrella it corrupted your hosts file. You will need to edit this file and remove all lines containing gs.apple.com.

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Thanks for this post. It was my problem to restore 5.1 to iPhome 4.