Getting status 502 while posting to WCF Svc

Hi,

I've implemented a WCF service that allow user to post data and send an email to another user. This works fine in my development which is making an AJAX Post to:

http://domain/servicename

However, in my staging which has a load balancer implemented on it. I'm getting status 502. It also required me to post to (secured) https://domain/servicename. At first, I suspect the https was dropped in the load balancer.

In my case, I have to embed my svc in a dll. So, I am setting the configuration programmatically in MyServiceName.cs as embedded svc couldn't get settings from app.config. Yet, no luck.

...
public static void Configure(ServiceConfiguration config)
{
       config.AddServiceEndpoint(typeof(IServiceName), new BasicHttpsBinding(), "domain/service");

}
...

An important point is that many of the built in sitefinity controls are using WCF svc to grab data and they are working just fine on my staging! So, I suspect there are other reasons for getting 502 while posting to my svc. Any idea?

Thanks!