I attempted to upgrade my wife's iphone to 4.2 and it failed several times. My ISP is Cox network in San Diego. First I tried it on her PC running xp and got an 1013 error. Then I tried it on my Mac running OSX 10.6.5 and got the same error. So I decided to try it with my work computer (running xp) BUT I VPN'd in the corporate network and ...guess what? It worked without a hitch. So what gives with Cox communications and what is the work around? Thanks all.