Hi Sanjiv,
As you mentioned in earlier about upgrade of Host Agent,
can you please check below entries are maintained in host_profile file,
service/porttypes = SAPHostControl SAPCCMS SAPOscol
service/admin_users = smdadm daaadm (Note: only one user, which was used for smd agent installation).
After upgrade, did you restarted the Host agent and SMD agents ?
Best Regards,
Upendra