C3D first request problem

Hi all,

We have an application that has a login button and when you press it you can login with a certificate. This is working perfectly fine.

We have put in front of the app a virtual server with ssl profiles configured with C3D (Client Certificate Constrained Delegation) and add the C3D’s CA into the trusted store of the app’s server.

When we try to login through the virtual server we can and the app work as expected, the generated certificate reaches the app, the user is logged in and we see posible threahts on ASM.

However the login process is not exactly as if we do it directly with the app.

The first time a user tries to log in the browser ask for the certificate, the user selects it and then an error shows up in the browser but quickly dissapears beacause the browser automatically refreshes itself.

If the same user closes the browser and then open it and try to log in this time there is no error shown as the process goes normally like when the users log in directly in the app without the virtual server in the middle.

Client SSL profile:

Server SSL profile:

We also have an iRule like this on the virtual server to only ask for the certificate on the login page, not anywhere else:

when CLIENTSSL_CLIENTCERT {
    HTTP::release
}

when HTTP_REQUEST {
    # Some tests to determine if IS_LOGIN_PAGE
    if { IS_LOGIN_PAGE }{
        HTTP::collect
        SSL::session invalidate
        SSL::authenticate always
        SSL::authenticate depth 9
        SSL::cert mode request
        SSL::renegotiate
    }
}

Any thoughs on what could be the cause?

Any help is appreciated!