The server experienced a problem while attempting to send a heartbeat message to the SNMP subagent. This may be due to problems with communication or the SNMP subagent being unavailable.
The server attempted to contact the SNMP subagent again and re-synchronize, but this too failed. Heartbeat functions are disabled until the server is re-started.
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. Re-start the server if the heartbeat function is required.