I hit on this annoying little bugger while setting up snmpd :


snmpwalk -c servers compute-0-1 SNMPv2-MIB::sysDescr.0  No log handling enabled - turning on stderr logging
snmpwalk: No securityName specified

Version of snmp :

snmpd -v

NET-SNMP version:  5.5
Web:               http://www.net-snmp.org/
Email:             net-snmp-coders@lists.sourceforge.net

In this particilar case I had to specificaly add the security version (v1,v2c,v3) :

snmpwalk -v 2c -c servers compute-0-1 SNMPv2-MIB::sysDescr.0

And it works 🙂