SSL Error

I keep getting the following error message when trying to make an SSL Connection via VB.NET's WebRequest:

The underlying connection was closed: Could not establish trust relationship with remote server.

VB Code:

Private Function SendXML(ByVal xml As String) As String
 
        Dim aURL As String
 
        aURL = "https://www.site.com:10027"
 
        Dim wr As HttpWebRequest = Net.WebRequest.Create(aURL)
 
        Dim cert As System.Security.Cryptography.X509Certificates.X509Certificate
        cert = System.Security.Cryptography.X509Certificates.X509Certificate.CreateFromSignedFile("C:\cert\ca.cer")
        wr.ClientCertificates.Add(cert)
 
        wr.ContentType = "text/xml"
        wr.KeepAlive = False
 
        wr.Method = "POST"
 
        Dim sw As StreamWriter
 
        Try
            sw = New StreamWriter(wr.GetRequestStream())
            sw.Flush()
            sw.AutoFlush = True
        Catch ex As Exception
            Return False
        End Try
 
        Try
            sw.Write(xml)
            sw.Flush()
            sw.Close()
 
        Catch ex As Exception
            Return False
        End Try
 
        wr.Timeout = 900000
        Dim wres As HttpWebResponse = wr.GetResponse
 
        Dim s As IO.Stream
        s = wres.GetResponseStream
 
        Dim sr As IO.StreamReader
        sr = New IO.StreamReader(s)
 
        Return sr.ReadToEnd
 
    End Function

hmm I need to send some things (like on a submit form) and then download the output(just registering in a forum and then retrieving the "you are being logged in blablabla" but in a site which is https(SSL).

I am facing the same trouble, anyway to go over it?

Here is how I got it to work, note that first line:

Code:

---

        ServicePointManager.CertificatePolicy = New MyPolicy

        Dim sURL As String =  "https://www.site.com:10027"

        Dim uUri As Uri = New Uri(sURL)

        Dim wr As HttpWebRequest = Net.WebRequest.Create(uUri)

        Dim cert As System.Security.Cryptography.X509Certificates.X509Certificate
        cert = System.Security.Cryptography.X509Certificates.X509Certificate.CreateFromCertFile("C:\Cert\ca.cer")

        wr.ClientCertificates.Add(cert)

        wr.ContentType = "text/xml"
        wr.KeepAlive = False

        wr.Method = "POST"

        Dim sw As StreamWriter

        Try
            sw = New StreamWriter(wr.GetRequestStream())
            sw.Flush()
            sw.AutoFlush = True
        Catch ex As Exception
            Throw ex
        End Try

        Try
            sw.Write(xml)
            sw.Flush()
            sw.Close()

        Catch ex As Exception
            Throw ex
        End Try

        wr.Timeout = 120000
        Try
            Dim wres As HttpWebResponse = wr.GetResponse


            Dim s As IO.Stream
            s = wres.GetResponseStream

            Dim sr As IO.StreamReader
            sr = New IO.StreamReader(s)

            Return sr.ReadToEnd

        Catch ex As Exception
            Throw ex
        End Try

---

Oh yeah, Here's MyPolicy

Code:

---


Imports System.Net
Imports System.Security.Cryptography.X509Certificates
Public Class MyPolicy
    Implements ICertificatePolicy
    Public Function CheckValidationResult(ByVal srvPoint As ServicePoint, ByVal cert As X509Certificate, ByVal request As WebRequest, ByVal problem As Integer) As Boolean Implements ICertificatePolicy.CheckValidationResult
        Return True
    End Function
End Class

---

and this?

Quote:

---

cert = System.Security.Cryptography.X509Certificates.X509Certificate.CreateFromCertFile("C:\Cert\ca.cer")

---

What does the file have inside?

ca.cer is a file the web site emailed to me to use with their site. It is their SSL Certificate File. I think there is a way you can find it in your browser's cache if you visit the site.

In IE look at -Tools -Internet Options -Content -Certificates

Hope that Helps.

Hey, I tried finding the .CER file but I couldn't :S

People over here http://www.vbforums.com/showthread.p...hreadid=290738 say that i must buy a certificate in order to use it...do I?!

I could try to make like you and mail the guys from the webpage im trying to access but I guess they simply won't answer :S

Any ideas?