Most internet video players initiate outbound requests and receive responses through the connection they opened. They do not normally require an unsolicited inbound connection. Opening router ports without a documented need adds complexity and can expose services unnecessarily.
Check the actual instructions
A guide for a game server or home surveillance system may not apply to a video player. Use the player's genuine documentation and distinguish watching remote media from hosting a service for other people to access.
Investigate ordinary causes first
Verify the supplied server address, account state, local internet access and app compatibility. If a firewall blocks outbound traffic, inspect that specific rule with the network administrator rather than adding unrelated inbound exceptions.
Remove old experiments safely
If previous troubleshooting left broad rules, review them against the original requirement. Record settings before changing them and avoid disrupting other household services. A player that works after an unrelated rule change is not enough to establish causation.
