Windows event logs function failed ufter upgrade/downgrade

[oxycom]

In december I tried to upgrade to new Zabbix version (1.8.9) but system was unstable on my environment so 10 days later I decided to compile previous stable, version 1.8.4 (case ZBX-4444) and I explore it back without problem .... except logging windows events functionality.
In system (Latest data -> Windows_Logs) for every Windows client I can see last events dated 23.12.2012 and no more. When I clean history than I lost Windows_Logs from Latest_data. No other funcionality gone!. I have no errors in server log as well in client log. I use about 50 Windows clients and all of them have last info in Windows_Logs dated 23.12.2012 and no station has later dated info.
As I mentioned before everything working properly, I can telnet to customer from Zabbix server and check version, Zabbix controls state of client with ping, I can check all other system parameters on line (processor, memory, disk space etc.).
I tried to create new items and triggers to alive funcionality without efect. I have no new idea where and how to check or fix this state. I noticed in some treads similar description but no solution at all :-(
Have anybody idea what happened and how to alive Windows_Logs?
L.J.

[oxycom]

The problem is solved. The guilty was firewall on Zabbix server where one rule droped all traffic outocomming on port 10051 from serwer. Checking logs on Windows needs probably first activation from Zabbix server on 10051 port and responce back to server on port 10050. On Zabbix server I logged only incomming traffic so diagnostic was harder.
Tread could be closed ;-)
L.J.