Create port-bindings.md

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+# Server port bindings
+
+This document aims to provide an admin with knowledge on what ports Jellyfin binds and what purpose they serve.
+
+### Static ports
+
+* 8096/tcp is used by default for HTTP traffic. This is admin configurable.
+* 8920/tcp is used by default for HTTPS traffic. This is admin configurable.
+* 1900/udp is used for service autodiscovery. This is _not_ admin configurable as it would break client autodiscover.
+
+### Dynamic ports
+
+* Completely random UDP port bind. It picks any UDP port that is unused on startup. It is used for specific LiveTV setups involving HD Homerun devices.