[ubuntu] Can't connect through telnet

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http://ubuntuforums.org – I'm trying to run the command "telnet s1.runtime.heroku.com 5000". I get an error message "unable to connect to remote host: no route to host". I have set port forwarding for the application "heroku" on port 5000, to my machine's static ip address. I am running ubuntu 11.04, on a home wireless network connected to a DSL router. I have no firewall set up Is my next step contacting my isp to ask if they block port 5000? (Hardware)