(407) Proxy Authentication Required

Question:
I have the following code and it works for most users, some get a Proxy Error

The remote server returned an error: (407) Proxy Authentication Required
At System.Net.HttpWebData(String URLtoCall)

What can I do ?

      Dim uri As New Uri(URLtoCall)
      Dim request As WebRequest = WebRequest.Create(uri)
      Dim response As WebResponse = request.GetResponse()
      Dim stream As Stream = response.GetResponseStream
      Dim reader As New StreamReader(stream)
      Dim data As String = reader.ReadToEnd()
      RetWebData = ""
      RetWebData = data
      reader.Close()
      stream.Close()
 
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