Hello,

I am using VS2005 Professional. I had encountered a problem with adding a web service, where the following error message would be shown:

"Error creating the Web Proxy specified in the 'system.net/defaultProxy' configuration section."

Steps to reproduce:

1. Start a new project (C# Console Application)

2. Project -> Add Web Reference

3. Enter URL to WSDL (or any URL)

4. The error message above appears in the textbox labeled "Web services found at this URL:"

Investigating the problem further, the method System.Net.WebProxy.GetDefaultProxy() returned the error:

System.Net.Sockets.SocketException: An address incompatible with the requested protocol was used.

System.Net.SafeCloseSocketAndEvent.CreateWSASocketWithEvent(AddressFamily addressFamily, SocketType socketType, ProtocolType protocolType, bool autoReset, bool signaled)
System.Net.NetworkAddressChangePolled..ctor()
System.Net.AutoWebProxyScriptEngine.AutoDetector.Initialize()
System.Net.AutoWebProxyScriptEngine.CurrentAutoDetector_get()
System.Net.AutoWebProxyScriptEngine..ctor(WebProxy proxy, bool useRegistry)
System.Net.WebProxy.UnsafeUpdateFromRegistry()
System.Net.WebProxy..ctor(bool enableAutoProxy)
System.Net.WebProxy.GetDefaultProxy()

I was able to resolve the problem by installing and then uninstalling IPv6 on the current network adapter (IPv6 had not been installed previously). I am posting this in case anyone encounters the same problem.