Mrtg config problem

Jeg har et problem når jeg prøver at lave en config til Mrtg

server:~# cfgmaker localhost --output /etc/mrtg.cfg
--base: Get Device Info on public@localhost:
SNMP Error:
no response received
SNMPv1_Session (remote host: "localhost" [127.0.0.1].161)
                  community: "public"
                request ID: -102847730
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
at /usr/share/perl5/SNMP_util.pm line 627
SNMPWALK Problem for 1.3.6.1.2.1.1 on public@localhost::::::v4only
at /usr/bin/cfgmaker line 828
WARNING: Skipping public@localhost: as no info could be retrieved

--base: Writing /etc/mrtg.cfg

Hvad er der galt?