eventlog does not collect log from Unix hosts

eventlog does not collect log from Unix hosts

Hi all

I've just started to use Eventlog and I use a Windows machine as my server,with windows hosts I have no problem and everything go well but I have a problem with Unix hosts.
I configure Syslog on my Ubuntu and CentOS machines and they added to the server as well but server collects no log!!and the weird part is that when I use Syslog viewer it shows the messages but Eventlog  doesn't collect any logs.
help me please

best Regards,
Siavash
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