According to a wireshark it looks like PRTG is doing a lookup on OID:
1.3.6.1.4.1.2021.9.1.3
Doing an SNMP walk on the 1.3.6.1.4.1.2021 OID with the PRTG SNMP tester there is no 1.3.6.1.4.1.2021.9 OID tree. it goes from the 1.3.6.1.4.1.2021.4 tree then skips to 1.3.6.1.4.1.2021.10 tree.
PRTG returns error 222 on the sensor.
CPU and Memory sensors work. Only disk utilization via SNMP doesnt.
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