The display device shows a spinning "Connecting" overlay, the standby dot never appears, or the display opens but doesn't respond when the director taps Live/Preview/Standby.
Display link uses a different room code than the controller. Most common cause.
Hotel, venue, or corporate WiFi blocks WebSocket connections on port 443.
Display opened a bookmarked link from a previous session with a different room code.
Display device is on a network with no internet access — captive portal not accepted.
On the controller, note the 6-character room code shown in the Room Code card.
On the display device, check the URL — it should contain ?room=XXXXXX with the same code.
If they don't match, tap Copy Display Link on the controller and resend it, or show the QR code and have the display device scan it fresh.
On the display device, go to Settings → WiFi and turn WiFi off.
The device will switch to cellular (4G/5G/LTE). Reload the display page.
If it connects immediately, the venue WiFi is blocking WebSocket connections. Cue Light works fine on cellular — keep WiFi off for the shoot.
Venue WiFi tip: Hotel and convention centre guest WiFi commonly blocks WebSocket connections. If you're at a recurring venue that always has this problem, just use cellular on display devices from the start. It's faster and more reliable anyway.
Open Safari or Chrome and try to load any website (e.g., google.com).
If a login or terms page appears — accept it to gain internet access.
Return to the Cue Light display URL and reload.
On iPhone/Android: tap the address bar, tap the reload button, or close and reopen the tab.
On desktop: press Cmd+Shift+R (Mac) or Ctrl+Shift+R (Windows) to hard reload.
If the display had an old bookmarked URL — delete it and use a fresh link from the controller's Copy Display Link button.
Close everything and open a new room. Share the fresh QR code to all display devices.
Open Cue Light