'''QuickTime Streaming Server (QTSS)''' wasis a [[Server (computing)|server]] or service [[Daemon (computer software)|daemon]] that was built into [[Apple Inc.|Apple's]] [[macOS Server|Mac OS X Server]] until OS X Server 10.6.8. It delivers [[video]] and [[sound reproduction|audio]] on request to users over a [[computer network]], including the [[Internet]]. Its primary GUI configuration tool is [[QTSS Publisher]] and its web-based administration port is 1220.{{elucidate|reason=TCP or UDP?|date=June 2020}} It also uses port UDP/7100.<ref name="Adminsub port 7100">{{Cite web |date=2016-03-30 |title=Port 7100 (tcp/udp) - Online TCP UDP port finder - adminsub.net |url=https://www.adminsub.net/tcp-udp-port-finder/7100 |url-status=live |archive-url=https://web.archive.org/web/20200618174809/https://www.adminsub.net/tcp-udp-port-finder/7100 |archive-date=2020-06-18 |access-date=2020-06-18 |website=www.adminsub.net}}</ref> When used in conjunction with [[QuickTime Broadcaster]], it wasis possible to deliver live real-time video and audio to multiple users over networks.
The protocol used has since been superseded with [[HTTP Live Streaming]] used in [[iOS]] and [[Mac OS X Lion]] and [[OS X Mountain Lion]].