Enterprise Manager

Folks,

Can I pick your brains, I keep recieving the smtp alert from Grid control which says;

Agent is Unreachable (REASON = Connection refused) but the host is UP

upto 5 minutes later the smtp mail is received

Agent is Unreachable clear : <SERVER> - Agent Unreachable is cleared

I have tried the usual

$> cd $ORACLE_HOME/bin
$> emctl start agent
$> emctl status agent
$> emctl upload agent

This is successful however shortly the messages re-appear. This is on a pre-production grid control which manages 35+ databases on 25+ Hosts and the smtp errors are filling the mailbox with these messages. FYI - The Hosts causing my headache are from a 2 node RAC hosting several instances including ASM running agent version 10.2.0.4.0

The network team says they are not seeing any connection drops in their logs.

Any assistance would be appreciated