IIS and port 80 with Redmine

Hi
We are running Redmine on port 80 with IIS. - All is good so far.
But now we need port 80 on that computer for other purposes, so Redmine has to run on another port, like 3000

I have changed properties in IIS admin, default website (Redmine is the only website running on that server) to port 3000, but this doesn´t work.

Does anyone know whether there are other places to tweak than in IIS admin?.