It seems to be some weird network issue, occuring only in some networks...
In my case DNS seems to be a problem.
It doesn't work with my DSL connection:
It does however if i use a VPN, e.g. hotspot shield.
As you can see i even ask the same DNS server (8.8.8.8, google DNS) both times and get different answers.
I have no idea why this happens, since both are recursive DNS requests to the same server. That means, 8.8.8.8 does the iterative DNS resolving and should give the same answer, seemingly depending on my route to the DNS.
For now i'll work around it by adding
74.52.103.162
www.telltalegames.com
to my hosts file, until it's fixed.