WCF calling service problem

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Hello every body

i have developed a wcf app using .net framework 4.0,
i have not problem with it and it is working without error in my local machine.
but i changed the machine and deploye it in a server that has rooted IIS (with public IP).

public interface IOssServices
    {
        [OperationContract]
        [WebGet(UriTemplate = "GetPlates",
            BodyStyle = WebMessageBodyStyle.WrappedRequest,
            ResponseFormat = WebMessageFormat.Json,
            RequestFormat = WebMessageFormat.Json)]
        IList<string> GetPlates();
        [OperationContract]
        [WebGet(UriTemplate = "GetTasks",
            BodyStyle = WebMessageBodyStyle.WrappedRequest,
            ResponseFormat = WebMessageFormat.Json,
            RequestFormat = WebMessageFormat.Json)]
        OssResponeMessage GetTasks();
        [OperationContract]
        [WebInvoke(Method = "POST",
            UriTemplate = "Login",
            BodyStyle = WebMessageBodyStyle.WrappedRequest,
            ResponseFormat = WebMessageFormat.Json,
            RequestFormat = WebMessageFormat.Json)]
        OssResponeMessage Login(OssRequestMessage request);
        [OperationContract]
        [WebInvoke(Method = "POST",
            UriTemplate = "GetTaskDetail",
            BodyStyle = WebMessageBodyStyle.WrappedRequest,
            ResponseFormat = WebMessageFormat.Json,
            RequestFormat = WebMessageFormat.Json)]
        OssResponeMessage GetTaskDetail(OssRequestMessage request);
    }

calling each of this operations and my local pc will not face error but in server and by an ip gives me error except the

GetPlates

operation. i mean that only this operation works fine either in my pc or server.

this is my web.config

<system.serviceModel>
    <behaviors>
      <endpointBehaviors>
        <behavior name="httpBehavior">
          <webHttp />
        </behavior>
      </endpointBehaviors>
      <serviceBehaviors>
        <behavior name="">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
    <services>

      <service name="JooyaServices.OssServices">
        <endpoint address=""
                     behaviorConfiguration="httpBehavior"
                     binding="webHttpBinding"
                     contract="JooyaServices.IOssServices" />
      </service>

      <service name="JooyaServices.TrackingServices">
        <endpoint address=""
                     behaviorConfiguration="httpBehavior"
                     binding="webHttpBinding"
                     contract="JooyaServices.ITrackingServices" />
      </service>
    </services>
  </system.serviceModel>

calling the method causes error in iis and this is the event log output:

WebHost failed to process a request.
 Sender Information: System.ServiceModel.Activation.HostedHttpRequestAsyncResult/39508813
 Exception: System.Web.HttpException (0x80004005): There was no channel actively listening at 'http://OssServer.local:16025/OssServices.svc/GetTasks'. This is often caused by an incorrect address URI. Ensure that the address to which the message is sent matches an address on which a service is listening. ---> 
System.ServiceModel.EndpointNotFoundException: There was no channel actively listening at 'http://OssServer.local:16025/OssServices.svc/GetTasks'. This is often caused by an incorrect address URI. Ensure that the address to which the message is sent matches an address on which a service is listening.
   at System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result)
   at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.HandleRequest()
   at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
   at System.Runtime.AsyncResult.End[TAsyncResult](IAsyncResult result)
   at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result)
 Process Name: w3wp
 Process ID: 7560

anybody know why this happend and how can i use my services ?
tanx in advance.
sorry for weak english.