I had a strange problem recently that I was unable to reach any subdomain within Stanford.edu.  It turned out that my problem was due to Time Warner cable, which I was using.  There is a quick and simple fix to get around this.  All I had to do was to change the DNS of my wireless to Google’s public DNS and it worked like magic.  The process takes just 2 minutes and you can find detailed instructions for it here: https://developers.google.com/speed/public-dns/docs/using.