Hello,

I am monitoring 144 hosts through zabbix mainly 2.0.0-rc4

Today I switched the agent.ping item from "normal" to "active".

Some hosts (44 out of 100) did not pick up the change, and after minutes (~25 min) were still not reporting back.

Putting one of them in debug, and testing again, I see:

32634:20120518:160727.127 refresh_active_checks('zabbix.XXXX.com',10051)
 32634:20120518:160727.129 Sending [{
        "request":"active checks",
        "host":"HOSTNAME.XXXX.com"}]
 32634:20120518:160727.129 Before read
 32634:20120518:160727.130 Got [{
        "response":"success",
        "data":[
                {
                        "key":"agent.ping",
                        "delay":10,
                        "lastlogsize":0,
                        "mtime":0},

and

32634:20120518:160727.130 In add_check('agent.ping', 10, 0, 0)

but then I don't see the agent.ping being sent back, and the queue starts building up ( strangely always 45 of them).

Restarting the agent fixes temporarily the problem, but then if I test it again (active -> normal and then normal -> active again) , it presents the same problem.

Do you have any idea on how to debug it further?

Regards
Alessandro