Same issue here, but I get the whole download then it disappears after it is fully downloaded and I get the same error. Here is MY solution...
I am running Vista (YUCK!), have an iPhone 3GS, and running ESET Smart Security 18.104.22.168.
- Updated to Itunes version 10.3.1.55 (Tried the 4.3.3 download again, while disabling the firewall ESET...same problem)
- Had an issue with some Windows updates not installing (KB2518870 & KB2478663 with error code 66A). It was found that my Microsoft.NET Framework 4 Client Profile was corrupt. I fixed it this way....
- "Go to; Control Panel>Programs and Features, find 'Microsoft.NET Framework 4 Client Profile' and repair it. Then if you try installing them again, they SHOULD work (assuming it's the same for Windows 7)." Found this here..
- Updated the Windows updates again (which finally installed correctly)
- Tried the 4.3.3 download again with the ESET firewall disabled and it FINALLY worked.
If your running Windows and have this Microsoft.NET Framework 4 Client Profile try to repair it...this could be your problem. Grrrrrrrrrrrr Windows!!!!!!!!!!!!
"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 This may be because out-of-date or incorrectly configured security or firewall software is interfering, an old version of iTunes is installed, an entry in your hosts file redirecting requests to gs.apple.com (see error 1004 above), or because of 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. Error 3194 most likely indicates you do not have the latest version of iTunes installed Update to the latest version of iTunes. "
If you ever used tinyumbrella, you will have to edit your Hosts file to remove references to gs.apple.com:
"For steps to edit the Hosts file and allow iTunes to communicate with the update server, see iTunes: Troubleshooting iTunes Store on your computer, iPhone, iPad, or iPod; follow steps under the heading Blocked by configuration (Mac OS X / Windows) > Rebuild network information > The hosts file may also be blocking the iTunes Store."