Why can’t my TV or streaming device find a screen-casting source on the same network?
Quick answer
Being on the same Wi-Fi does not guarantee that two devices can cast to each other: the source app or browser and the TV or streaming device must support the same casting method. For Google Cast from Chrome, check that the receiver is supported, Chrome is updated, and both devices have a strong connection to the same Wi-Fi network. If they’re compatible, check relevant app permissions and whether network isolation may be blocking discovery; ask the network administrator about isolation rather than changing security settings yourself. [S1] [S2]
The question, the details, the next step.
My phone or computer and TV are on the same Wi-Fi, but the TV doesn’t appear as a casting option. What should I check first?
Start with compatibility, not router settings. “Casting” can refer to different systems, and sharing a Wi-Fi name does not by itself show that a source and receiver use the same method. Identify the exact source—such as a particular app or Chrome—and the TV or streaming-device model. Then check whether that source’s casting method is supported by the receiver. Google Cast discovery requires compatible Cast-enabled apps and devices on the home network. [S2]
I’m trying to cast a Chrome tab from my computer. What does that require?
For casting a Chrome tab or screen using Google Cast, the receiver must be a supported Chromecast or Google TV device, or a TV with Google Cast. The computer needs an updated Chrome browser and a strong connection to the same Wi-Fi network as the receiver. These requirements apply to this Google Cast method; they are not a universal checklist for every TV, app, or casting system. [S1]
Check each requirement without changing router settings. If the receiver or source does not support this method, the TV may not appear even when both devices are connected to Wi-Fi.
What if I’m casting from an app on my phone instead of Chrome?
Check whether that specific app supports the casting method your receiver uses. Google’s FAQ describes discovery between compatible Cast-enabled apps and devices on the home network; Wi-Fi connection alone is not enough if the app or receiver is incompatible. [S2]
On an iPhone or iPad, check the app’s local-network permission in the device settings if the app offers one. Google’s FAQ notes that local-network permissions can matter on some Apple operating systems. [S2] If you can’t verify the permission or the device still can’t find the receiver, consult the app or device maker’s guidance rather than assuming the TV is faulty.
Both seem compatible and connected, but they still don’t see each other. Should I change router settings?
Don’t disable security features or change router settings just to test casting. Network isolation can prevent devices from discovering one another; Google identifies it as a possible obstacle, including on guest or public networks. [S2] If you suspect isolation, ask the network administrator whether the network allows local device discovery and which network is approved for casting. Don’t try to bypass network controls.
You can keep track of what you know with a short comparison: source app or browser; intended casting method; receiver model; whether compatibility is confirmed; whether both use the same Wi-Fi; and whether a relevant app permission was checked. Mark unknown details as unknown rather than guessing.
How do I tell whether this is a compatibility issue or a discovery issue?
Work through the checks in order: confirm that the source and receiver support the same casting method; check that method’s specific requirements; then consider local discovery, including relevant app permissions and possible network isolation. [S1] [S2]
For Chrome with Google Cast, compare your setup with the supported-receiver, updated-browser, and strong same-Wi-Fi requirements. [S1] If compatibility is confirmed but discovery still fails, ask the network administrator about isolation. The guidance identifies possible requirements and obstacles, but it cannot establish which issue is causing a problem in your particular setup.
A practical checklist
Write down the exact source app or browser and TV or streaming-device model.
Confirm that the source and receiver support the same casting method.
For Chrome with Google Cast, check for a supported receiver, updated Chrome, and a strong connection to the same Wi-Fi. [S1]
On an Apple device, check whether the app has a relevant local-network permission. [S2]
If the network may isolate devices, ask its administrator; do not disable security settings yourself. [S2]
A few more useful answers
Does seeing both devices connected to the same Wi-Fi prove they can cast to each other?
No. The source and receiver also need a compatible casting method, and local discovery may be affected by permissions or network isolation. [S2]
Should I switch to a guest or public Wi-Fi network to test casting?
Not as a general fix. Guest or public networks may use isolation that prevents discovery; ask the network administrator which network is approved for casting. [S2]
Does the Chrome checklist apply to every casting system?
No. The supported receiver, updated Chrome, and strong same-Wi-Fi requirements cited here are for casting a Chrome tab or screen with Google Cast. [S1]
Sources
References used for this guide.
- [S1] Cast a Chrome tab to a TV with Google Cast support.google.com · Checked
- [S2] Google Cast FAQ for TVs, displays, and speakers support.google.com · Checked