Error when setting up URL

[asparker24]

I've just started using Subsonic, and I have no problem logging on to the site from my home network, but when i try to from another location I can't even get the logon screen. In the Network Tab, it says, successfully forwarding port 80 with no error message.

There is an error under the section where I set the web address, it says that my server URL is registered, but could not connect to it (ConnectTimeoutException)

Where do I go from here? Do i need to have a Static IP address to set this up correctly? PLEASE HELP