Error While Adding WebService Reference : Value cannot be null. Parameter name: discoveryError & mexError

Question

Steps I followed to add the service reference:

1. Add Service reference

2. Click Advanced

3. Click Add Web Reference

4. Add the url : https://suyatitechie.crm8.dynamics.com/AppWebServices/EmailSignatureService.asmx

5. Hit the "->" button After this in the right panel I get the

   Value cannot be null. Parameter name: discoveryError & mexError

Could not find any resources regarding this. anyone with the same issue?

Answer 1

1 - Add the 'References' for dll System.Web.ApplicationServices
2 - Find the below tag in your web.config

    <system.web>
    ....
     <webServices>
       <protocols>
          <remove name="Documentation"/>
       </protocols>
     </webServices>
    </sytem.web>