How do I display the host or device names of a Syslog sender, instead of its IP address?

On the EventSentry server, use the command prompt to run:
nslookup 192.168.1.1
(replace "192.168.1.1" with the IP address of a Syslog-sending device or server)

This will tell you which DNS server is being utilized by your EventSentry server. You can then manually create an A record in that DNS server to specify the Syslog-sending device's name and IP address. To see if it has worked, you can use the command prompt on the EventSentry server to run:
ping -a 192.168.1.1
(replace "192.168.1.1" with the IP address of a Syslog-sending device or server)

This should now display the Syslog-sending device's name in the reply. If so, please restart the Network Service in EventSentry, and any new Syslog data received from this sender will display the DNS name of the sender instead of the IP address of the sender. The DNS name will be displayed in the Sender column on the Syslog page in the EventSentry Web Reports, and the DNS name will also be displayed in the text of any Syslog-To-EventLog events that you have configured.