Hello Yuksel,
You will be able to find here:
https://service.sap.com/~form/sapnet?_SHORTKEY=01100035870000764122&_SCENARIO=01100035870000000202&
This guide: "Administrator's Guide Deskt. Conn. prof. ed. 2.0 SP04 Patch2"
On page 32 of this guide there is a procedure how to configure X.509 Certificate-Based Authenticationfor Desktop Connection for SAP CRM.
If this will not be helpful, you have to create a CSS ticket.
Regards,
Donka DImitrova