Webclient downloadstring error RRS feed

  • Question

  • Hi,

    We are using below code to download the content from xml file as string and save the string content to xml file. wc.DownloadString is failing with error as shown below:

    using (WebClient wc = new WebClient())
                    wc.Headers.Add("email", "Test@somedomain.com");
                    wc.Headers.Add("password", "somepassword");
                    string xml = wc.DownloadString("https://somedomain:443/Test1/export/MyCauseAPI.xml");
                    XmlDocument downloadXML = new XmlDocument();
                    downloadXML.Save("C:\\Test\\New Requirements\\mctestAPI2.xml");

    The underlying connection was closed: An unexpected error occurred on a send.Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

    We are not seeing this error when we access the URL https://somedomain:443/Test1/export/MyCauseAPI.xml from Postman.

    Monday, May 7, 2018 11:01 AM

All replies

  • I will suggest you to compare the headers when you send the request from Postman, and make sure you add all the missing headers.

    Also you can refer following link


    Gaurav Khanna | Microsoft MVP | Microsoft Community Contributor

    Monday, May 7, 2018 11:17 AM
  • The headers used in the above code are same as Postman

    Monday, May 7, 2018 5:04 PM
  • The "email" and "password" are sent in plain text as HTTP headers?  That violates the HTTP standard.  You aren't allowed to invent arbitrary new headers unless you use an "X-" prefix.  Are you sure they aren't sent as POST values embedded in the request data?  Does your server expect cookies?  Does it expect a User-Agent string?

    Does your server support TLS or does it require SSL?  There are a couple of web articles talking about that.

    Tim Roberts, Driver MVP Providenza & Boekelheide, Inc.

    Monday, May 7, 2018 5:57 PM
  • Hi,

    The above code is part of SSIS script component and  was working without any issue from last 3 months. However, It is stopped working from 3rd May 2018. I tested this  url https://somedomain:443/Test1/export/MyCauseAPI.xml from postman. It is working. Also, I tested this from kingswaysoft adapter. It is working fine.

    Tuesday, May 8, 2018 4:19 AM
  • It's quite possible that the server changed its security attributes.  Check the article below to see if it is related to your problem:


    Tim Roberts, Driver MVP Providenza & Boekelheide, Inc.

    Tuesday, May 8, 2018 4:56 AM