VB.NET Requires Chilkat v11.0.0+

Examine SSL/TLS Server Certificate

See more Socket/SSL/TLS Examples

Demonstrates how an application can examine and check a server's SSL/TLS certificate. VB.NET

Dim success As Boolean = False

'  This example assumes the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim socket As New Chilkat.Socket

'  Connect to a server.
Dim useTls As Boolean = True
Dim maxWaitMs As Integer = 2000
success = socket.Connect("www.intel.com",443,useTls,maxWaitMs)
If (success = False) Then
    Debug.WriteLine(socket.LastErrorText)
    Exit Sub
End If


'  If we get here, the TLS connection ws made..
'  In any SSL/TLS handshake, the server sends its certificate in a TLS handshake message.
'  Chilkat will keep it cached within the object that made the connection.
'  Get the server's cert and examine a few things.
Dim cert As New Chilkat.Cert
socket.GetServerCert(cert)

Debug.WriteLine("Distinguished Name: " & cert.SubjectDN)
Debug.WriteLine("Common Name: " & cert.SubjectCN)
Debug.WriteLine("Issuer Distinguished Name: " & cert.IssuerDN)
Debug.WriteLine("Issuer Common Name: " & cert.IssuerCN)

Debug.WriteLine("Expired: " & cert.Expired)
Debug.WriteLine("Revoked: " & cert.Revoked)
Debug.WriteLine("Signature Verified: " & cert.SignatureVerified)
Debug.WriteLine("Trusted Root: " & cert.TrustedRoot)

'  Sample output:

'  Distinguished Name: C=US, ST=California, O=Intel Corporation, CN=*.intel.com
'  Common Name: *.intel.com
'  Issuer Distinguished Name: C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Organization Validation Secure Server CA
'  Issuer Common Name: Sectigo RSA Organization Validation Secure Server CA
'  Expired: False
'  Revoked: False
'  Signature Verified: True
'  Trusted Root: True