The underlying connection was closed: A connection that was expected to be kept alive was closed by the server.

Question

User1279383592 posted

Hello Everyone,

I'm working on WCF. & i'm experiencing the subjected error. I searched online & found that writing a method (which is the following) could resolved this...but doing so gives me some compile time error related to GetWebRequest :

protected override WebRequest GetWebRequest(Uri uri)
        {
            HttpWebRequest webRequest = (HttpWebRequest) base.GetWebRequest(uri);

            webRequest.KeepAlive = false;
            webRequest.ProtocolVersion=HttpVersion.Version10;
            return webRequest;
        }

Please let me know, what to do to fix the subjected problem.

Thanks in Advance

Nabh19

Answer 1

User220959680 posted

compile time error related to GetWebRequest

webRequest.KeepAlive = false;

Refer http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.keepalive.aspx

Let us know the current exception.

Answer 2

User260886948 posted

Hi,

When occur the below problem, you must explicitly set the KeepAlive property to FALSE so that the connection will be closed by itself and re opened for every request. This will avoid the issue of attempting to use a closed connection.

There is no direct way you can set the KeepAlive to FALSE. This is a 'Protected' property on the WebRequest. When you use web services, you must first derive a class from your webservice class and then set this flag to FALSE in the inherited class.

Assume you have a web reference with the name 'Banking' and a webservice class called 'Transaction'. Typically, you will use the class as follows in your client:

dim obj as new Banking.Transaction()
obj.MakeTransaction()

To set the KeepAlive property, you must inherit a class from Banking.Transaction in your client. Create a new class called "BankTransaction" in the client project. Now inherit the "GetWebRequest" method in this class as shown below:

Public Class BankTransaction
     Inherits Banking.Transaction

        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

            return webRequest
        End Function

End Class

We are explicitly setting the property KeepAlive to FALSE in the above inherited method. Now, use the inherited class to make the webservice calls. This will solve the error.

For more information, please try to refer to:
http://www.dotnetspider.com/resources/2596-e-underlying-connection-closed-A-connection.aspx . 

Hope it can help you.

Best Regards,
Amy Peng