I have several sensors monitoring a RoomAlert Model 11E. Randomly, and in no particular order, the sensors alert with "No Data" and the following error message:
"No response (check: firewalls, routing, snmp settings of device, IPs, SNMP version, community, passwords etc) (SNMP error # -2003)"
The sensor recovers after a few minutes and then shortly after a different sensor alerts. I tried adjusting the SNMP time out period from the default 5 seconds to 30 seconds but this appeared to have no effect. SNMP V1, Port 161, SNMP Timeout is 30 seconds. My probe and device are behind a Cisco router and switch.