SSL in j2ee

Hi,

I already enable the ssl in my j2ee after refer the guide from sdn. I having a problem for client certificate authentication. I import the private key and the root key to my browser and test the connection. The connection work fine when i use "Request client certificate" but after i change to "Require client certificate" the browser show "SSL peer cannot verify your certificate." error. Any wrong will my client certificate?

Thanks.