What do I do? There was no endpoint listening at < ... >

I am new to IIS and asp.net devlopment but I am an experienced developer. I have written a VB .net 3 tier application consisting of a presentation tier (on the remote client), a DataEntity tier and a data accesstier + of cource the ServiceLib.
I am using Visual Studio 8 and when I set the Service WCF Option to "Start WCF Service Host when debugging another project in the same solution" *and* I have App.config set as (below) it works fine (all local):
<endpoint address="http://localhost:8731/Design_Time_Addresses/DataServiceLibLA/Service1/mex" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IService1" contract="ServiceReference1.IService1" name="WSHttpBinding_IService1">

As soon as I try to change the endpoint to be the IIS server (and disable the WCF local service host) to this: "http://linksador.com/app_code/DataServiceLibLA.Service1.svc" it fails with the following error message:

{"There was no endpoint listening at http://linksador.com/app_code/DataServiceLibLA/Service1/ that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details."}

Either I'm doing something wrong (propable), or there is something like a setting I am missing on the server side.

Can anybody help (p l e a s e)?