1. Open Manage computer certificates by typing on search certificates
2. Expand the personal folder from the left menu and click on certificates
3. Delete SCEPUser2048 from the menu on your right
4. RC on the same window and from all tasks select request new certificate
5. Click next and next on those two windows
6. From the next window checked the computer and click enroll
You will get a successful enrollment window then close Manage computer certificates. Now try to connect to KKinet.