1.4.2 and 1.6: Can't allocate shared memory for collector. [Invalid argument]

[just2blue4u]

I had to restart my Zabbix agent (1.4.2) on a Red Hat 8 Server. I got that error, so i decided to update the agent to 1.6. This didn't solve the problem so i googled and found out about SHMMAX:

[root@oracle-1-shk etc]# grep shmmax /etc/sysctl.conf
# kernel.shmmax = 2147483648
kernel.shmmax = 4294967296

This should REALLY be enough (maybe too much? It's that high because of the Oracle DB).

Then i saw something about ipcs and deleted everything that had to do with zabbix:

[root@oracle-1-shk etc]# ipcs

----- Gemeinsamer Speicher: Segmente -----
key shmid Besitzer Rechte Bytes nattch Status
0x34928d90 32769 oracle 640 859832320 40

----- Semaphorenfelder -----
key semid Besitzer Rechte nsems Status
0xc3157e1c 131073 oracle 640 152
0xc3157e1d 163842 oracle 640 152
0xc3157e1e 196611 oracle 640 152

----- Nachrichtenwarteschlangen -----
key msqid Besitzer Rechte used-bytes messages

But still my agent dies directly after it's started:

[root@oracle-1-shk etc]# /etc/init.d/zabbix_agentd start
Zabbix Agent starten: [ OK ]
[root@oracle-1-shk etc]# ps -efa|grep zabbix
[root@oracle-1-shk etc]# tail -n2 /var/log/zabbix/agentd.log
13329:20081028:144410 zabbix_agentd started. ZABBIX 1.6.
13329:20081028:144410 Can't allocate shared memory for collector. [Invalid argument]

Could it be bacause of less memory availible?

[root@oracle-1-shk etc]# free
             total       used       free     shared    buffers     cached
Mem:       3704552    3684660      19892          0     181376    3333936
-/+ buffers/cache:     169348    3535204
Swap:      4096564      65728    4030836

It's a DB-Server, so i'd really like to have it monitored asap again... :-/

Best thanks,
Heiner