Template:FAQ:Applications 06
From Net-SNMP Wiki
This is almost definitely due to the access configuration of the agent.
Many pre-configured systems (such as most Linux distributions) will only
allow access to the system group by default, and need to be configured
to enable more general access.
The easiest way to test this is to try a GETNEXT request that ought to return the entry of interest. e.g.
snmpgetnext -v1 -c public localhost UCD-SNMP-MIB::versionTag
instead of
snmpget -v1 -c public localhost UCD-SNMP-MIB::versionTag.0
If the agent responds with "end of MIB" or a different object, then either the agent doesn't implement that particular object at all, or the access control won't allow you access to it.
See the entries on access control in the AGENT section for how to configure the Net-SNMP agent, or consult the agent's own documentation.