Generally speaking, Port 7070 is used for multimedia applications such as Apple Quicktime Streaming Server and RealAudio. Certain games – such as City of Heroes and City of Villains – also make use of the port. It goes without saying that, as a result, you’re not likely to make use of this port on your server.
So what can you do if it appears to be open and shouldn’t be?
There’s a good chance your router is to blame here. Try listening on the port to see if it’s really open – if you succeed, then there’s a good chance you’re in the clear. If it fails, check your server for any services or utilities that might be using the port – if they aren’t vital to your server operations, disable them.