No Active Checks running [1.8]

[zab-bix]

Hello,

Today we've updated Zabbix from 1.6.6 to 1.8.
After successfully upgrading the active checks doesn't work anymore.

The queue got stucked with several items on some systems, but not all.

Some agents with older 1.4.6 Clients work, so some with 1.8 Client.

Here is a part of a debug log with zabbix agent 1.8:

31442:20100114:150208.542 JSON before sending [{
"request":"agent data",
"data":[
{
"host":"serv1",
"key":"system.cpu.load[,avg5]",
"value":"0.020000",
"clock":1263477727}],
"clock":1263477728}]
31442:20100114:150208.543 JSON back [{
"response":"success",
"info":"Processed 0 Failed 1 Total 1 Seconds spent 0.000187"}]
31442:20100114:150208.543 In check_response({
"response":"success",
"info":"Processed 0 Failed 1 Total 1 Seconds spent 0.000187"})
31442:20100114:150208.543 Info from server: Processed 0 Failed 1 Total 1 Seconds spent 0.000187
31442:20100114:150208.543 OK

The server debug log looks ok, but is flooded in short time.

How can I fix that problem?

Thanks for your help

[zab-bix]

Hi,

I've just added a new system.
The checks are just running fine.

Is there any way to readd all systems and import the old history data?

Edit:

The systems not checked properly are marked as not available.
ICMPPING is working and resolving correct data for each added system.