0 SCCM: Agent Install fails

1. Log on to the SCCM server via Remote desktop
2. Open Internet Information Services (IIS) Manager Console
3. Expand Server Name –> Sites –> Default Web Site
4. click on CCM_Client site. On right side pane, double click SSL Settings. Select Accept on Client Certificates: section.
5.  Click Apply on Action Pane.
6. Repeat these steps 4 through 5 again for : 

• CCM_Incoming
• CCM_Outgoing
• CCM_System and 
• SMS_MP