IIS Settings for using HTTPRuntime.Cache

Question

I use HTTPRuntime.Cache in my WCF service. It works locally (I mean "localhost:1234", not in IIS). But it doesnt work at server IIS. Is there any settings to do in IIS? The code in my method is like:

var response = (Response<CommonListObjects>) HttpRuntime.Cache.Get("commonObjects");

if (response!=null)
{
    return response;
}

var service = ObjectFactory.GetInstance<ICommonListObjectsService>();
var listObjects=service.Get();

HttpRuntime.Cache.Add("commonObjects", listObjects, null, DateTime.Now.AddHours(2).Cache.NoSlidingExpiration, CacheItemPriority.Normal, null);

return listObjects;