Using WebClient or HttpWebRequest: "The Remote name can ' t be solved"

Cause of error: No proxy server settings are configured, you need to do the following in the configuration section.

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Collapse Image Symptoms
Note: The following. NET Framework class library namespaces are referenced in this article:

System.Net

When you use a WEB service that uses the HTTP proxy server for a. NET client, you may receive the following error message:
The underlying connection was closed: The remote name could not be resolved.
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Collapse image Reason
The HTTP Proxy Server Web service does not exist between. NET clients and the correct proxy settings have not been configured.
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Collapse Image Solution
To resolve this issue, provide the correct proxy configuration settings to the. NET client.
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The default settings in the Machine.config file are as follows:

<configuration>
<system.net>
<defaultProxy>
<proxy
Usesystemdefault = "true"
/>
</defaultProxy>
</system.net>
</configuration>

The default setting does not automatically detect proxy settings if you set Usessystemdefault to False and then explicitly specify the proxy server. To explicitly specify a proxy server, use the Machine.config or Web. config file, or specify the server programmatically.

To specify a 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 programmatically change settings by using a Web proxy object, use the following code example:

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 up a proxy server for NTML authentication, use the following code example:
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 proxies as default values.
<configuration>
<system.net>
<defaultProxy>
<proxy
proxyaddress = "http://proxyserver:80"
bypassonlocal = "true"/>
</defaultProxy>
</system.net>
</configuration>
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Using WebClient or HttpWebRequest: "The Remote name can ' t be solved"