zabbix_agentd -t and zabbix_get return different values

[demonito]

Hi all! I use zabbix to monitor MegaCli raid state. It worked fine, but once it failed for some reasons.

Here is the zabbix_agentd.conf:

oradb-01:~ # cat /usr/local/etc/zabbix_agentd.conf
PidFile=/var/run/zabbix/zabbix_agentd.pid
LogFile=/var/log/zabbix_agentd.log
EnableRemoteCommands=1
Server=77.**.**.**
ServerActive=77.**.**.**
Hostname=oradb-1

UserParameter=megacli.raid.state,/usr/bin/sudo /opt/MegaRAID/MegaCli/MegaCli -LDInfo -Lall -Aall | grep Optimal | wc -l

If I try to check the value of megacli.raid.state locally, it returns 2:

oradb-01:~ # sudo -u zabbix zabbix_agentd -t megacli.raid.state
megacli.raid.state                            [t|2]

But when I try to check it from zabbix server, it returns 0:

23:00:29 terra # zabbix_get -s 192.168.168.10 -p 10050 -I 77.**.**.** -k megacli.raid.state
0

My /etc/suders.conf:

Defaults targetpw    # ask for the password of the target user i.e. root
%users ALL=(ALL) ALL # WARNING! Only use this together with 'Defaults targetpw'!

root	ALL=(ALL) ALL
zabbix	ALL=NOPASSWD:	/opt/MegaRAID/MegaCli/MegaCli

All other parameters work fine.

Well, the question is: why? And what should I check to find a reason?