For a Fire TV Set-Top Box or Stick you can do the following:
Press and hold the Select and Play/Pause buttons at the same time for about five seconds.
Or, From the main screen of your Fire TV, go to Settings.
Then go to Device.
And choose Restart. Confirm your decision by selecting Restart.
Alternatively, you can unplug the power cord from the device, wait 10 seconds and then plug it back in.
For a Fire TV Edition Smart TV you can do the following:
Press the Power button on the remote, wait for 10 seconds and then press it again.
Alternatively, you can unplug the power cord from the outlet, wait 10 seconds and then plug it back in.
3. Reboot
One of the main causes with the inability to get on the Internet is that your networking equipment could have malfunctioned. Sometimes performing a reboot will resolve this issue.
Your network may consist of one or more of the following networking devices:
Modem
This is the primary device used to get you on the Internet.
Has either a coaxial cable, fiber cable, or phone cord plugged into it.
Typically has 1 or 2 Ethernet ports which connect to a router.
Gateway
This is an all-in-one device that has both a modem and a router built in. It is a primary device used to get you on the Internet.
Has either a coaxial cable, fiber cable, or phone cord plugged into it.
Typically has 3 or 4 Ethernet ports which connect to a your computers and smart devices.
Typically has Wi-Fi built into it
Router
This device allows you to connect multiple devices to your Internet connection using a single external IP address.
Typically has 3 or 4 Ethernet ports which connect to a your computers and smart devices.
Typically has Wi-Fi built into it.
Switch
This device helps to extend the wired functionality of devices by providing your additional Ethernet ports.
These are typically plug and play.
This device is not a router.
Access Point
This device will provide wireless access to your existing network.
Used to extend the range of your network
Usually plugged into a router / gateway via Ethernet connection.
Range Extender
This device will extend the range of your existing WiFi network by rebroadcasting your WiFi network.
Standalone device plugged into a power source.
Usually located 15-30 feet from the router.
Next we will want to power cycle the networking devices.
Modem / Gateway
Unplug the power from the device.
Wait 30 seconds.
Plug the power back into the device.
Wait for the device to go online.
Router
Unplug the power from the device.
Wait 30 seconds.
Plug the power back into the device.
Wait for the device to go online.
Switch
Unplug the power from the device.
Wait 30 seconds.
Plug the power back into the device.
Access Point / Range Extender
Unplug the power from the device.
Wait 30 seconds.
Plug the power back into the device.
4. Check Internet Connection
Updates can only download and install automatically when your device has an active internet connection.
From the main screen:
Select Settings
Select Network
Your preferred Wi-Fi network should already be selected and shown with a check mark.
If you are not connected to any networks, select your preferred network from the list now.
Enter your Wi-Fi network password, if needed.
You'll see a confirmation message on-screen when your device is successfully connected to your selected network.
Most Fire TV devices are only capable of connecting to Wi-Fi.
5. Test the App
Open your Netflix app and test if it works.
6. What's next?
7. Connect to Wi-Fi
Select your network name from the list.
Type in your network password.
Your Fire TV will let you know when it connects successfully.
8. What's next?
9. Reset Password
Reset your password by sending yourself a password reset email from Netflix.
If your preferred language is already selected, select English and sign out, then repeat the steps above.
Return to the device experiencing the issue and sign out and sign back in to save this setting.
Changing the language for your profile will also change the subtitle and dubbing options you see, putting your preferred language first on available titles.
11. Uninstall Netflix
Using your remote, from the main Fire TV menu go to Settings.
From there, go to Applications.
Then go to Manage Installed Applications.
Select Netflix.
And choose Uninstall. Confirm you decision by selecting Uninstall.
12. Install Netflix
Using your remote, from the main Fire TV menu go to Apps.
Select Netflix in featured apps. If you don't see it, select Search.