The underlying connection was closed

Resolution A

Resolution B

• Use the static WebProxy.GetDefaultProxy method. For more information, visit the following Microsoft Web site:
  http://msdn2.microsoft.com/en-us/library/system.net.webproxy.getdefaultproxy(vs.71).aspx
• Define a <proxy> element in the application configuration files. For more information, visit the following Microsoft Web site:
  http://msdn2.microsoft.com/en-us/library/aa903369(VS.71).aspx
• Configure the .NET client to use HTTP 1.0 by changing the HttpWebRequest.ProtocolVersion property. For more information, visit the following Microsoft Web site:
  http://msdn2.microsoft.com/en-us/library/system.net.httpwebrequest.protocolversion(vs.71).aspx
  Note By default, the .NET Framework uses HTTP 1.1.
• If you are using Secure Sockets Layer (SSL), make sure that the proxy is not configured to use any rules that are blocking HTTPS.
• If you are using autoproxy, click the following article number to view the article in the Microsoft Knowledge Base:
  873199 How to use autoproxy in managed code

Resolution C

• The Microsoft WinSockProxy WS2.0 Provider (Wspwsp.dll) file
• The
  HKLM\System\CurrentControlSet\Services\DnsCache
  registry key
• The
  HKLM\System\CurrentControlSet\Services\WinSock2
  registry key

Resolution D

1. Create a new class by inheriting from the generated proxy class.
2. Add a method to the class to override the GetWebRequest method. This change lets you access theHttpWebRequest object. If you are using Microsoft Visual C#, the new method must be similar to the following.

   class MyTestService:TestService.TestService
   {
       protected override WebRequest GetWebRequest(Uri uri)
       {
           HttpWebRequest webRequest = (HttpWebRequest) base.GetWebRequest(uri);
           //Setting KeepAlive to false
           webRequest.KeepAlive = false;
           return webRequest;
       }
   }

   If you are using Microsoft Visual Basic .NET, the new method must be similar to the following.

   Class MyTestService 
        Inherits TestService.TestService
           Protected Overrides Function GetWebRequest(ByVal uri As Uri) As System.Net.WebRequest
               Dim webRequest As System.Net.HttpWebRequest
               webRequest = CType(MyBase.GetWebRequest(uri), System.Net.HttpWebRequest)
              ‘Setting KeepAlive to false 
               webRequest.KeepAlive = False
               GetWebRequest = webRequest
           End Function
   End Class

3. Create an instance of the new class, and then use the new class to call the Web service method.

Resolution E

• When a ServicePoint object has been idle for the time that is specified in the MaxIdleTime property, it is eligible for garbage collection.
• Make sure that the ServicePointManager.MaxServicePointIdleTime property is set before any HTTP requests are made. For more information about the ServicePointManager.MaxSercvePointIdleTime property, visit the following Microsoft Web site:
  http://msdn2.microsoft.com/en-us/library/system.net.servicepointmanager.maxservicepointidletime(vs.71).aspx

Resolution F

1. Click Start, click Control Panel, click Administrative Tools, and then click Internet Information Services (IIS) Manager.
2. Click the name of the computer that you want to reconfigure, and then click Web Sites.
3. Right-click the Web site that you want to reconfigure, and then click Properties.
4. Type a new value in the Connection timeout box, and then click OK.
5. On the File menu, click Exit.

Resolution G

Resolution H

Resolution I

Resolution J

ServicePointManager.SecurityProtocol= SecurityProtocolType.Ssl3|SecurityProtocolType.Tls;

Resolution K

<connectionManagement>
  <add address="*" maxconnection="12"/>
</connectionManagement>

Resolution L

Resolution M

Resolution N

• HttpWebRequest.Timeout
• HttpWebRequest.ReadWriteTimeout

Resolution O