[Ubuntu] SNMP test credential Failed

[Ubuntu] SNMP test credential Failed

 Hello!

I've set up OpManager 8(8022 Free Edition) on my Ubuntu 9.04 Desktop yesterday, and leave computer running to test...

But I think I've a problem with SNMP in OpManager (or my linux, why not :) ) no disk utilisation, no cpu and memory used, etc...
This is what I've set up :

(added snmp + snmpd in my system)

/etc/snmp/snmpd.conf :
com2sec readwrite default         perso
disk    /    100000
disk    /home    100000
disk    /mnt/raid    100000

/etc/default/snmpd :
SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -I -smux -p /var/run/snmpd.pid 192.168.1.77'
(192.168.1.77 is the default ethernet address of my computer)

Added port 161 in firewall rules

Inside OpManager web interface config : (sorry for bad translation, I've it in french... I'l try to translate as well I can)
Admin Panel > Discover > Parameters of login's informations > New
in the new windows opened :
SNMP v1/2
name : perso
read SNMP : perso
write SNMP : perso
port SNMP : 161

When I try a command given on Ubuntu website, to test snmp running :
snmpwalk -v1 -c perso 192.168.1.77 .1.3.6.1.2.1.1.1.0
result :
SNMPv2-MIB::sysDescr.0 = STRING: Linux minux 2.6.28-15-generic #52-Ubuntu SMP Wed Sep 9 10:49:34 UTC 2009 i686

Services queries like Web, DNS are OK inside OpManager computer's relative webpage.

So what can be wrong on my config ?
Thx for Help !































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