Asset Explorer agent configuration is getting error "Endpoint Central is unreachable due to SSI handshake failure. "

Asset Explorer agent configuration is getting error "Endpoint Central is unreachable due to SSI handshake failure. "

I just installed the AssetExplorer and followed the instructions to install the Desktop Central on the same server. 
Everything looks fine except the "agent configuration", which is getting an error message: "Endpoint Central is unreachable due to SSI handshake failure. "
Tried to go to the page "Apps & Add-ons - Integrations - UEM Products" and the test connection is successful but the error still occurs in "Agent configuration" 

Appreciate anyone can help on this issue. thanks !
 
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