Strange one

[alistargore]

I am running newsnab(apache) sabnzb, and other things on my computer. As i need to access them when I'm at work, I have a dyndns address.

If I goto alistairgore.dyndns-.com:8080 it works that will take you to sabnzb
If I goto alistairgore.dyndns-ip.com it doesn't it should take you to newsnab.

I don't understand