Why am I unable to forward logs from a Linux machine to Windows using Splunk 6.3?

I am new to Splunk and downloaded Splunk free to several machines, Linux and Windows. All machines are on the same subnet. I have been successful at forwarding logs from Windows to Linux, and from Windows to Windows, but I cannot seem to see the Linux logs on the Windows Splunk. I see the TCP handshake and the log text, but Splunk never shows the machine name or the logs in the data summary. Using Splunk 6.3.0 on CentOS 6.6. The logging capability seems to work fine on the Linux machine when viewed locally. The Windows machines are both using Splunk 6.3.0 as well. Many Thanks