Metadata publishing for this service is currently disabled.

Reason 1:

In your web.config

<service name="A.B.C">

but your class is：

namespace A.B
{
.....
public class D : E
{

Those names need to match! The

name=

attribute on the

<service>

tag in config must be exactly what your service class is called - fully qualified, including namespace - so in your case here, it should be:

<service name="A.B.D">

Reason 2:

Make sure Web.config have httpGetEnabled or httpsGenEnabled parameter in <serviceMetadata> tag.

<behaviors>
<serviceBehaviors>
<behavior>
<!-- To avoid disclosing metadata information, set the values below to false before deployment -->
<serviceMetadata httpGetEnabled="true"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>