No Such Instance currently exists at this OID

Hi folks,

Following an upgrade from Debian squeeze to wheezy*, the SNMP agent on  
one of my servers stopped responding to queries for data from  
lm-sensors. Before the upgrade it did this:

   ~# snmpget -v2c -c public <host> .1.3.6.1.4.1.2021.13.16.3.1.1.4
   LM-SENSORS-MIB::lmFanSensorsIndex.4 = INTEGER: 3

Now it does this:

   ~# snmpget -v2c -c public <host> .1.3.6.1.4.1.2021.13.16.3.1.1.4
   LM-SENSORS-MIB::lmFanSensorsIndex.4 = No Such Instance currently \
   exists at this OID

In this case, as for the other servers, the libsnmp-base package is  
installed that contains the LM-SENSORS-MIB file. Otherwise the  
configurations for lm-sensors and snmpd are identical and the output  
from the 'sensors' command looks fine. The misbehaving machine only  
has a slightly different sensor chip, although that never used to be a  
problem and it'a even supported by the same kernel module.

Any idea what might be preventing snmpd from relaying the sensors data?

Thanks,

Jaap

*) Both Debian squeeze and wheezy use snmpd (net-snmp) 5.4.3. However,  
squeeze has lm-sensors 3.1.2 and wheezy has 3.3.2.

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