remote logging problem with syslog utility

[shri_22ram]

I am using Two centOS linux machines. From the third machine (CentoOS_Main) i am redirecting syslog messages to centoOS_1 . After some time i am redirecting syslog messages to CentOS_2. It works fine. After sometime i rebooted my CentOS_Main machine and i am observing very few syslog messages sent to centOS_1. Actually nothing has to sent to centOS_1.
I have observed this by capturing packets by tcpdump.

In /etc/syslog.conf i have used the ip of the centOS_1 machine. After that manually edited the syslog.conf by deleting the centOS_1 ip and entering centOS_2 ip.

Thanks,
Shriram