Cablemas also blocks port 6112. Which means Starcraft can’t connect to Battle.Net.
It also means World of Warcraft won’t work the way it’s supposed to. I’m pretty sure Xbox Live and PSN users are disallowed from connecting.
I understand blocking the lower ports, but this is fucking ridiculous.
My advice? Go with DSL (Telnor, Telmex) or other cable providers who don’t have their heads stuck up their arses.