Orbeon SSL Problem

In my XHTML page, I use the xform tag <xf:model id="*****" schema ="apps/path">.
Under the condition of SSL, when the browser tries to return back to server to get the resource of "apps/path", there is a SSL problem "peer not authenticated".

In reference to other pages which do not include these xforms tags, they are working well.

I used the self-signed certificate and version of Orbeon is 4.0



What is the problem? Hope somebody could help me, give some advice.

Thanks