I've getting peppered with emails from 10g grid

Target Name=hostname:4889
Target Type=Agent
Host=hostname
Metric=Status
Timestamp=05-Nov-2008 09:15:22 GMT
Severity=Unreachable Start
Message=Agent is Unreachable (REASON = Connection refused: connect) but the host is UP.
Notification Rule Name=Agents Unreachable
Notification Rule Owner=SYSMAN
Notification Count=1

then a minute later I'm getting a cleared alert....

Target Name=hostname:4889
Target Type=Agent
Host=hostname
Metric=Status
Timestamp=05-Nov-2008 09:28:45 GMT
Severity=Unreachable Clear
Message=Agent Unreachability is cleared. The current status of the target is UP.
Notification Rule Name=Agents Unreachable
Notification Rule Owner=SYSMAN
Notification Count=1


Has anyone come across this before?