Unable to discover a particular device, in this case, a Fortinet FortiADC - Load Balancer 1.3.6.1.4.1.12356.112.100.403 in Spectrum due to:
#Got endOfMIBView. Making sure no more oids left. Trying ...
DX NetOps Spectrum 20.2 or later
The SNMP agent on the device is broken. An SNMP walk show the oids going down in value instead of up followed by a LEXORDER error.
1.3.6.1.6.3.15.1.2.2.1.13.1 , Integer , 0
1.3.6.1.6.3.15.2.1.1.0 , Counter , 0
1.3.6.1.6.3.15.2.2.1.0 , Counter , 0
#Got endOfMIBView. Making sure no more oids left. Trying 1.3.6.1.6.3.15.2.2.2
#Got endOfMIBView. Making sure no more oids left. Trying 1.3.6.1.6.3.15.2.3
#ERROR:LEXORDER:1.3.6.1.6.3.15.2.1.1.0 , Counter , 0
#ERROR:LEXORDER:1.3.6.1.6.3.15.2.2.1.0 , Counter , 0
#Agent is broken. Getnext returned request oid. Trying 1.3.6.1.6.3.15.2.1.2
#ERROR:LEXORDER:1.3.6.1.6.3.15.2.2.1.0 , Counter , 0
#Agent is broken. Getnext returned request oid. Trying 1.3.6.1.6.3.15.2.2
The issue is with the device itself. The error - "Got endOfMIBView", means that Spectrum is querying the device for OIDs that the device's agent cannot understand.
Check for updated MIBs and firmware for the device and if neither are available, contact the Vendor (in this case - Fortinet) to fix their agent/MIB.