Wcf – Load balancing error with WCF service – NLB

UPDATE 3:
I created a Visual Studio 2008 test project and tried to create a service reference to shared site WCF service reference and received the following error:

There was an error downloading
'http://apps.mydomain/MyService.svc'.
The request failed with HTTP status
400: Bad Request. Metadata contains a
reference that cannot be resolved:
'http://apps.mydomain/MyService.svc'.
Content Type application/soap+xml;
charset=utf-8 was not supported by
service
http://apps.mydomain/MyService.svc'.
The client and service bindings may be
mismatched. The remote server returned
an error: (415) Cannot process the
message because the content type
'application/soap+xml; charset=utf-8'
was not the expected type 'text/xml;
charset=utf-8'.. If the service is
defined in the current solution, try
building the solution and adding the
service reference again.

UPDATE 2:
@Nick – I tried your suggestion of explictly setting the address of each endpoint with the fully qualified path of each server and I still get the same result.

Also, when I try to set the listenUri attribute with the shared site URL, I get a 400 bad request error instead of a 404 error.

UPDATE
After some additional research, there were some IIS configuration setting conflicts between http://apps1.mydomain and http://apps2.mydomain and was able to get past the "Server Application Unavailable" error.

Now I am getting a 404 error when I tried to browse to the shared site (http://apps.mydomain), but I am able to browse to the http://apps1.mydomain and http://apps2.mydomain service reference.

Original Problem

My companys uses Microsoft NLB to load balance traffic between our IIS servers. I recently deployed a WCF service on to each IIS 6 Windows Server 2003 Standard Edition SP1 servers. I received the following error when I tried to browse to the shared domain name using IE 7:

Server Application Unavailable The
web application you are attempting to
access on this web server is currently
unavailable. Please hit the "Refresh"
button in your web browser to retry
your request.

Administrator Note: An error message
detailing the cause of this specific
request failure can be found in the
application event log of the web
server. Please review this log entry
to discover what caused this error to
occur.

The consumer will point to the http://apps.mydomain to use the service but virtual domain is mapped to http://apps1.mydomain or http://apps2.mydomain. If I browse to the service on each server, I do not receive that error.

The service is currently using a anonymous basicHttpBinding.

Has anyone else experienced this issue?

History

Before this error started occurring, I received the following error when I broswed to all three domain name (http://apps.mydomain, http://apps1.mydomain, http://apps2.mydomain):

This collection already contains an
address with scheme http. There can
be at most one address per scheme in
this collection.

I used the ServiceHostFactory class to customize my .svc file to specify a custom service factory. Then I create our custom factory by inheriting from ServiceHostFactory and overriding as required.

public class MyFactory : ServiceHostFactory
{
    protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
    {
        return new ServiceHost(serviceType, baseAddresses[0]);
    }
}

<%@ ServiceHost Language="C#" Factory="MyFactory" Debug="true" Service="MyService" CodeBehind="~/App_Code/MyService.cs" %>