Hello

I am trying out the free version of PRTG. One of the basic tests I am doing is to check if SNMP polling is working from the PRTG station. The OID I am polling is 1.3.6.1.2.1.1.5 for sysName.

I can get a result using snmpwalk from CLI

snmpwalk -c public -v 2c x.x.x.x 1.3.6.1.2.1
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (25303833) 2 days, 22:17:18.33

However, if I create a new probe with this OID (custom string), I get no responses. I know the IP address and community values are correct. I downloaded SNMPTester and it too fails to work. The failure code is "Value: No such instance (SNMP error # 223)". Any idea why I am not able to pull this OID from PRTG or from SNMPTester when snmp walk from CLI works fine?

Thanks,

Swami

Article Comments

Hello,

can you read the SNMP Uptime with the SNMP Tester (not a specific OID)?

Best Regards.


Oct, 2010 - Permalink

Is there any access-list active on the switch / device? Are you polling from the same IP / management range ?


Oct, 2010 - Permalink

I also have this issue. I add new sensor : SNMP Disk Free After some time i see : No such instance (SNMP error # 223) Can you provide me the info about it? The snmpd.conf on my Linux server is configured and if i use zabbix it can view the disk usage but zabbix no!


Dec, 2011 - Permalink

If the sensor works but then later on ceases to work with the error "No such instance (SNMP error # 223)", that means that for reasons unknown to us the interface number did change. I'm afraid then there is very little we can do.


Dec, 2011 - Permalink

I'm afraid I'm seeing this same issue, except that it works via snmpwalk/get and PRTG 9, but not from SNMP Tester 3.2.

From SNMP Tester:

3/29/2012 8:02:26 AM TRANGO-APEX-RF-MIB|target|rf target rssi int 1.3.6.1.4.1.5454.1.60.3.8.2.0
3/29/2012 8:02:26 AM TRANGO-APEX-RF-MIB|rssi|rf rssi int 1.3.6.1.4.1.5454.1.60.3.9.2.0
3/29/2012 8:02:26 AM TRANGO-APEX-RF-MIB|rf pll|rf rfm rfpll 1.3.6.1.4.1.5454.1.60.3.10.1.0
3/29/2012 8:02:26 AM Found: 1

From linux in the same subnet:

# snmpwalk -v2c -c public 10.14.0.161 1.3.6.1.4.1.5454.1.60.3.9.2.0
SNMPv2-SMI::enterprises.5454.1.60.3.9.2.0 = INTEGER: -70
# snmpget -v2c -c public 10.14.0.161 1.3.6.1.4.1.5454.1.60.3.9.2.0 
SNMPv2-SMI::enterprises.5454.1.60.3.9.2.0 = INTEGER: -70
# snmpwalk -v2c -c public 10.14.0.161 1.3.6.1.4.1.5454.1.60.3.9    
SNMPv2-SMI::enterprises.5454.1.60.3.9.1.0 = Opaque: Float: -70.50
SNMPv2-SMI::enterprises.5454.1.60.3.9.2.0 = INTEGER: -70

And PRTG 9 is able to poll the OID from the MIB or if I manually enter the OID.

As you can see from above, other OIDs from the MIB work fine in SNMP Tester 3.2.

I don't believe there are any ACLs between devices on the same subnet - and even if there were, is it possible for it to restrict what OIDs could be polled?


Mar, 2012 - Permalink

The SNMP Tester and PRTG use the same functions and libraries. Just to check, is this a library scan? And in PRTG both the library scan and the individual OIDs work (with SNMP Custom Sensors)?


Mar, 2012 - Permalink