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The connection was closed unexpectedly for System.Net.HttpWebRequest.GetRequestStream() RRS feed

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    User1778311776 posted

    I created a web Asp.Net application (web forms) in c# with Sql Server Express for an online store integrated with PayPal. I used the code for pdt given at https://github.com/paypal/pdt-code-samples/blob/master/paypal_pdt.cs. Everything worked perfectly during development using sendbox and Visual Studio 2019, but on Windows Server 2016, after the payment on PayPal by redirecting to the page on the site in a protected area, the connection drops and generates an error on the line of code </div> <div>StreamWriter streamOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII)</div> <div>I tried everything, but I still can't understand what is wrong. </div> <div></div> <div>I added the following code:</div>

    • on the redirect page --> System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;
    • on the web.config --> <binding openTimeout="00:10:00" closeTimeout="00:10:00" sendTimeout="00:10:00" receiveTimeout="00:10:00" />

    Also I checked the SSL certificate, that is ok. I update the framework to the latest version.

    On IIS 8 there's this error:

    Event code: 3005 Event message: An unhandled exception has occurred. Event sequence: 22 Event occurrence: 1  Event detail code: 0  Application information:  Trust level: Full  Process information:  Process ID: 6472  Process name: w3wp.exe  Account name: NT AUTHORITY\SYSTEM  Exception information:  Exception type: WebException Exception message: The underlying connection was closed: The connection was closed unexpectedly.    at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)  at System.Net.HttpWebRequest.GetRequestStream()    at website.ProtectArea.shopping.Page_Load(Object sender, EventArgs e) in C:\xxxx\website\shopping.aspx.cs:line 44    at System.Web.UI.Control.OnLoad(EventArgs e)    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) Request information: 
    Request URL: https://website.com/ProtectArea/shopping + token info from PayPal
    Request path: /ProtectArea//shopping 
    User host address: xx.xxxx.xxx.xx 
    User: xxxx@xxxxx.com  Is authenticated: True  Authentication Type: ApplicationCookie Thread account name: NT AUTHORITY\SYSTEM Thread information:  Thread ID: 16 Thread account name: NT AUTHORITY\SYSTEM Is impersonating: False
    Thursday, March 12, 2020 3:23 PM

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