The problem is: for PROBLEM (operation) and OK (recovery problem), the ITEM.LASVALUE is equal: Up (1). For PROBLEM, should be Down(1), and Recovery Up (0).

Default message:

{EVENT.NAME}

:

{STATUS} {ITEM.LASTVALUE} {EVENT.TIME} {HOSTNAME}

Item:
Name: Ping to the server (TCP)
Key: agent.ping
Update interval: 30s

Trigger:

{HOSTNAME:agent.ping.nodata(1m)}

=1