unable to collect logs from cent os machine

Hi,

I added one CENTOS machine to event log anayzer but the logging is not happening. As per the help file the following changes were made to the configuration files of the host machine

Login as root user and edit the syslog.conf file in the /etc directory.
Append *.* @<server name> at the end
Save the configuration and exit the editor.
Edit the services file in the /etc directory.
Change the syslog service port number to 514, Save the file and exit the editor.
Restart the syslog service on the host using the command:
/etc/rc.d/init.d/syslog restart

eventlog analyzer build version:4.0.1
build number:4020

Kindly help us in resolving this

Another qury is that in case of windows machine we give username and password while adding the machine.In case of unix host this is not required.could you please explain this