One more update - our internet connection is satellite and the provider does some proxy/caching stuff and so that's probably a factor here since it's not effecting anyone else and it's just that one site (login.live.com) as far as I know. I had to switch back to Untangle to get around the problem and I also wanted to try Untangle v6. I do miss the stateful firewall and the live logs and so many features of the Astaro. I will probably switch back again and give Astaro another go at some point now that I have the config files saved so switching will be quick and easy.