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Is my web site using Kerberos or NTLM authentication?

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If you are not sure if Kerberos or NTLM authentication is used in your web application then you can use the script given in the following blog:

https://www.ilinfo.fr/blog/post/Page-de-test-Kerberos-et-de-delegation-ASPX.aspx

The blog is in French but you only need to copy the ASPX code which you can find below:

 <%@ Page language="VB" %>
 
<%@ Import namespace = "System.web" %>
 
<script language="VB" runat="server">
 
    Dim AuthLength
    Dim AuthOther
 
    Public Sub page_Load(ByVal Obj As Object, ByVal e As EventArgs)
        Authuser.Text = HttpContext.Current.User.Identity.Name().ToString
        ThreadId.Text = System.Security.Principal.WindowsIdentity.GetCurrent().Name().ToString()
  
        ' Get the authentication method being used
        AuthMethod.Text = Request.ServerVariables("AUTH_TYPE")
        AuthLength = Request.ServerVariables("HTTP_Authorization")
 
        ' If some other authentication method (other than Negotiate) gets used, call it "Other"
        If LTrim(RTrim(AuthMethod.Text)) <> "Negotiate" Then AuthOtherMethod()
 
        ' If Negotiate gets used, go straight to the subroutine to handle it
        If LTrim(RTrim(AuthMethod.Text)) = "Negotiate" Then AuthNegotiateMethod()
    End Sub
 
    Sub AuthOtherMethod()
        ' Since anonymous authentication will be blank, let's be sure we realize it's enabled to
        If LTrim(RTrim(AuthMethod.Text)) = "" Then AuthMethod.Text = "Anonymous"
    End Sub
 
    Sub AuthNegotiateMethod()
        ' Typically, NTLM will yield a 150 - 300 byte header, while Kerberos is more like 5000 bytes
        If Len(AuthLength) > 1000 Then AuthType.Text = "Kerberos"
        If Len(AuthLength) < 1000 Then AuthType.Text = "NTLM"
    End Sub
</script>
 
<html>
    <body>
        Authentication Method : <asp:label id=AuthMethod runat=server /><br>
        Protocole : <asp:label id=AuthType  runat=server /><br>
        Authenticated user: <asp:label id=Authuser runat=server /><br>
        Thread identity   : <asp:label id=ThreadId runat=server />
    </body>
</html>

Reference:

Page de test Kerberos et de délégation ASPX
https://www.ilinfo.fr/blog/post/Page-de-test-Kerberos-et-de-delegation-ASPX.aspx

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AMB