Q: I cannot restore my iphone

I cannot restore my iphone, because after downloading and extracting the firmware it says "the iphone update server could not be contacted or is temporarily unavailable". I have tried to restore it on another computer and it have failed. I have beeen trying for two days, and still no success. The apple software updater cannot connect the servers. I have tried everything from https://support.apple.com/kb/TS1275 (latest itunes and windows, restart, clearing lockdown cache, flushing dns cache, no other usb devices connected) except uninstalling my security software. It is very annoying. Please help!