A few days ago i installed cacti on a Debian Etch with snmp. After i configured snmp i noticed that when i clicked the host under Devices menu the host settings windows opens and it shows an error saying “SNMP not in use”. Maybe some of you got his error and you need help in resolving it. Here is how its done: Notice the “SNMP Community” box ? is it empty ? mine was and that is the problem, fill in the community you filled under snmpd.conf and press Save. Now Click your host again and it should work just fine.

SNMP not in use error in Cacti

And in the second picture its working fine after entering the community:

SNMP not in use error in Cacti resolved