Syslog Protocol - an overview | ScienceDirect Topics
Again some more protocols & variants | Weberblog.net
Syslog Source | Sumo Logic Docs
All About Syslog Protocol (What is Syslog, Default Port, Purpose etc)
Configure ports - Splunk Documentation
logs - Deployment of haproxy between devices and Syslog server - Unix & Linux Stack Exchange
RSyslog Documentation - rsyslog
Client Tools — RSyslog Windows Agent 7.1 documentation
vSphere PowerCLI - Configure syslog on VMware ESXi hosts and Enable security profile firewall | vGeek - Tales from real IT system Administration environment