System.Net.WebClient vs. Proxy Authentication 407 error

Question

I\'m trying to figure out how to robustly handle proxy authentication errors (HTTP 407 status code) when using the System.Net.WebClient class.

In the field, we see many

Answer 1

I know this is an old post but I had a similar problem trying to download an XML file using WebClient in an SSIS 2008R2 (SQL Server Integration Services) script task (VB.NET Code) through a Proxy Server to a remote site secured via SSL that also required authentication.

Took a while to find a solution and this post helped on the proxy side. Below is the script code that worked for me. Might be useful to someone searching for similar.

    Dim objWebClient As WebClient = New WebClient()
    Dim objCache As New CredentialCache()

    'https://www.company.net/xxxx/resources/flt
    Dim strDownloadURL As String = Dts.Variables("FileURL").Value.ToString

    'apiaccount@company.net
    Dim strLogin As String = Dts.Variables("FileLogin").Value.ToString

    'sitepassword
    Dim strPass As String = Dts.Variables("FilePass").Value.ToString

    'itwsproxy.mycompany.com
    Dim strProxyURL As String = Dts.Variables("WebProxyURL").Value.ToString

    '8080
    Dim intProxyPort As Integer = Dts.Variables("WebProxyPort").Value

    'Set Proxy & Credentials as a Network Domain User acc to get through the Proxy
    Dim wp As WebProxy = New WebProxy(strProxyURL, intProxyPort)
    wp.Credentials = New NetworkCredential("userlogin", "password", "domain")
    objWebClient.Proxy = wp

    'Set the Credentials for the Remote Server not the Network Proxy
    objCache.Add(New Uri(strDownloadURL), "Basic", New NetworkCredential(strLogin, strPass))
    objWebClient.Credentials = objCache

    'Download file, use Flat File Connectionstring to save the file
    objWebClient.DownloadFile(strDownloadURL, Dts.Connections("XMLFile").ConnectionString)