Cannot monitor CPU Load of Ubuntu PC via SNMP

This article applies as of PRTG 24

I cannot monitor the CPU Load of Ubuntu PC via SNMP. I activated SNMP and SNMPd and the firewall is disabled on both PCs. What should I do now?

Installing SNMP and SNMPd is not enough, you also need to do some adjustments to snmpd.conf. For more information, see the following checklist: Setting up SNMP on Linux.

Try this less cluttered snmpd.conf:

###########################################################################
#
# snmpd.conf
#
#   - created by the snmpconf configuration program
#



###########################################################################
# SECTION: System Information Setup
#
#   This section defines some of the information reported in
#   the "system" mib group in the mibII tree.

# syslocation: The [typically physical] location of the system.
#   Note that setting this value here means that when trying to
#   perform an snmp SET operation to the sysLocation.0 variable will make
#   the agent return the "notWritable" error code.  IE, including
#   this token in the snmpd.conf file will disable write access to
#   the variable.
#   arguments:  location_string

syslocation  "Somewhere"

# syscontact: The contact information for the administrator
#   Note that setting this value here means that when trying to
#   perform an snmp SET operation to the sysContact.0 variable will make
#   the agent return the "notWritable" error code.  IE, including
#   this token in the snmpd.conf file will disable write access to
#   the variable.
#   arguments:  contact_string

syscontact  El Administrato

# sysservices: The proper value for the sysServices object.
#   arguments:  sysservices_number

sysservices 76



###########################################################################
# SECTION: Agent Operating Mode
#
#   This section defines how the agent will operate when it
#   is running.

# master: Should the agent operate as a master agent or not.
#   Currently, the only supported master agent type for this token
#   is "agentx".
#   
#   arguments: (on|yes|agentx|all|off|no)

master  yes

# agentaddress: The IP address and port number that the agent will listen on.
#   By default the agent listens to any and all traffic from any
#   interface on the default SNMP port (161).  This allows you to
#   specify which address, interface, transport type and port(s) that you
#   want the agent to listen on.  Multiple definitions of this token
#   are concatenated together (using ':'s).
#   arguments: [transport:]port[@interface/address],...
agentaddress  udp:161






###########################################################################
# SECTION: Access Control Setup
#
#   This section defines who is allowed to talk to your running
#   snmp agent.

# rocommunity: a SNMPv1/SNMPv2c read-only access community name
#   arguments:  community [default|hostname|network/bits] [oid]

rocommunity  public  

Make sure to restart snmpd: 

sudo service snmpd restart