Temporary Wi-Fi can provide internet access while still preventing a phone, television and casting receiver from communicating locally.
How captive portals interfere
A captive portal redirects new clients to terms, room-number or voucher sign-in before normal access. Streaming devices may lack a suitable browser, and portal sessions may expire or bind to one device identifier. A successful Wi-Fi association therefore does not prove the television has usable internet access.
Why casting disappears
Client isolation blocks traffic between guests for safety. Discovery protocols used by casting commonly depend on local multicast or same-network visibility, which managed networks may filter. The cast icon can vanish even while both devices browse normally. This is a policy outcome, not evidence that changing DNS or repeatedly resetting hardware will help.
Use permitted solutions
Ask the network operator whether devices can be registered and casting is supported. Prefer the service’s official app directly on a controllable device, with HDMI only where property rules allow. Do not clone identifiers, disable protections or attach a router to managed networks without permission. Sign out and remove the network after the stay.
- Complete portal sign-in on each supported device
- Check whether clients can see one another
- Follow the venue’s network policy
Conclusion
Understanding the two controls prevents wasted troubleshooting and keeps temporary viewing within the network owner’s intended design.