The server experienced a problem while attempting to send a heartbeat message to the SNMP subagent. The SNMP subagent was unable to accept the heartbeat message. If the subagent was stopped and re-started, this is a normal message.
The server will attempt to contact the SNMP subagent again and re-synchronize.
Ensure that the subagent is running and that the TCP/IP protocol stack is functioning by using the tools that come with the particular TCP/IP suite on the platform in use.