#1 – Set Reg Keys
HKLM\Software\Microsoft\SMS\Components\SMS_SITE_COMPONENT_MANAGER\Component Servers\SERVERNAME
Set subkey ‘Deinstallation Start Time’ to 1
#2 – Set Connection
Select the DP, Select Site System Role, Properties, enable ‘Require the site system to initiate connections to this site system’
#3 – Restart Services
Restart SMS Executive and SMS Site Component Manager services.