Just for the record I tried turning off the web scanning part of the software, and still couldn't get in here. Then I turned Sophos completely off on my iMac, and I still couldn't get in to TS. I finally had to uninstall it completely. I won't be reinstalling it.
To uninstall Sophos:
Applications folder > Run the 'Remove Sophos Anti-Virus' application.
It will take a bit to do it's thing, and you'll need the admin login information.