Server to server doesn't work


I need to add some users of my openfire server to my gtalk roster. So I thought to use "Server to Server" feature.

The steps I followed were:

But nevertheless I am unable to add an user of my openfire server in my gtalk roster.

Why? I have only 2 doubts:

  1. before, my domain was configured in google apps. But now I removed from it to avoid confusion between openfire and google server;
  2. I installed only the RSA certificate. Maybe google wants also the DSA certificate?