although command : /usr/lib64/nagios/manubulon/check_snmp_int.pl -H 172.17.3.7 -L sha,aes -X Encr -l Nagios-USER -n Vlan77 -x Auth
it’s result : Vlan77:UP:1 UP: OK
but pending on
and what’s happen if you press the Check now button?
press more than one click but no thing happen
Check the Icinga 2 log file for any abnormalities.
Try to run the command as the icinga2 daemon user, to check if there is a permission problem on the check plugin.
Please also post command and service definition, including imports.