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PRB: Error on .NET client that consumes a Web service through an HTTP proxy server

This article was previously published under Q318140
SYMPTOMS
Note The following .NET Framework Class Library namespace is referenced in this article:

System.Net

When you use a .NET client to consume a Web service through an HTTP proxy server, you may receive the following error message:
The underlying connection was closed: The remote name could not be resolved.
CAUSE
An HTTP proxy server exists between the Web service and the .NET client, and the proper proxy settings have not been configured.
RESOLUTION
To resolve this problem, supply the proper proxy configuration settings to the .NET client.
MORE INFORMATION
The following are the default settings in the Machine.config file:
<configuration>   <system.net>      <defaultProxy>         <proxy            usesystemdefault = "true"         />      </defaultProxy>   </system.net></configuration>				
If the default settings do not automatically detect the proxy server settings, set usessystemdefault to false, and then explicitly designate the proxy server. To designate the proxy server explicitly, use either the Machine.config or Web.config file, or specify the server programmatically.

To specify the proxy server, set the Machine.config or Web.config file settings as follows:
<configuration>   <system.net>      <defaultProxy>         <proxy            usesystemdefault = "false"            proxyaddress="http://proxyserver"            bypassonlocal="true"         />      </defaultProxy>   </system.net></configuration>				
To change the settings programmatically by using a WebProxy object, use the following sample code:
Using System.Net;com.someserver.somewebservice.someclass MyWebServiceClass = new com.someserver.somewebservice.someclass();IWebProxy proxyObject = new WebProxy("http://myproxyserver:80", true);MyWebServiceClass.Proxy = proxyObject;MyWebServiceClass.MyWebMethod();				


Proxy servers that require NTLM authentication

To set NTML authentication for the proxy server, use the following sample code:
Using System.Net;WebProxy myProxy = new WebProxy("http://proxyserver:port",true); myProxy.Credentials = CredentialCache.DefaultCredentials; FindServiceSoap myFindService = new FindServiceSoap(); myFindService.Proxy = myProxy;
You can also use system-wide proxy as default. To do this, use the following settings in the configuration file:
<configuration>    <system.net>      <defaultProxy>         <proxy            proxyaddress = "http://proxyserver:80"            bypassonlocal = "true" />      </defaultProxy>   </system.net> </configuration>
REFERENCES
For more information, see the following Microsoft Developer Network (MSDN) Web sites: For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
307220 How to configure an XML Web service client by using the .NET Framework to work with a proxy server
Properties

Article ID: 318140 - Last Review: 06/18/2012 08:27:00 - Revision: 5.0

  • Microsoft .NET Framework 1.0
  • Microsoft .NET Framework 1.1
  • Microsoft ASP.NET 1.0
  • Microsoft ASP.NET 1.1
  • kbprb KB318140
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