Hi

Please can you check in below

SAP Solution Manager Diagnostics (SMD) Agent is not able to connect to SAP Host Agent

SAP Host Agent Troubleshooting Guide

Please check the authorizations of /usr/sap/hostctrl and host control folders and assign it to appropriate users/groups as well.

Check the note 1706469 and port if it is opened.

1862333 - Common Host Agent issues displayed in Agent Administration

Thnks

rishav