Samsung Galaxy S21

How to Fix Samsung S21 WiFi “Connection Failed” Issue

Seeing a "connection failed" message when trying to connect your Galaxy S21 to a router? Try these fixes!
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“Connection failed” is a common error you may encounter when trying to connect your Samsung Galaxy S21 to a WiFi network. This issue typically occurs when your device is unable to establish a stable connection with the WiFi network

There are a few common causes causing this issue, including router problems, network congestion, incorrect network settings, and software glitches on your device. 

Regardless of the cause, in this guide, we’ll walk you through 5 fixes to resolve the WiFi connection failed issue on your Samsung Galaxy S21. Each solution is detailed with step-by-step instructions, making it easy for you to follow along.

Let’s get started!

Note: Solutions in this guide will work on any Samsung Galaxy S21 model (S21, S21 Plus, S21 Fe, and S21 Ultra models.)

Editor’s note: We created these instructions using a Samsung Galaxy S21 running Android 13. Depending on your device’s software version, some steps and menu positions may look slightly different.

Quick Fixes

Restart your router, Forget the router and connect again, Check the router’s max connection limit, Reset the router, Reset network settings on your Galaxy S21.

Fix 01: Restart the Router and Galaxy S21

Restarting (power cycling) both the router and the Galaxy S21 is the simplest solutions to the WiFi “connection failed” issue. This is because doing so can resolve temporary network-related issues with both devices. 

To restart your Galaxy S21, follow these steps:

  1. Press and hold the power key and volume down key together until you get the power menu.
Force restart samsung
  1. Tap on the restart button.
  2. Confirm by tapping on the restarting button again.

To power cycle your router, follow these steps:

Restart the router
  1. Unplug the router from the power source.
  2. Wait for about 30 seconds to allow the device to fully power down.
  3. After the waiting period, plug the router back into the power source.
  4. Wait for the router to fully start up.

Once both devices have been restarted, connect your Galaxy S21 to the WiFi network again.

Fix 02: Forget the Router and Connect Again

Sometimes, the “connection failed” issue could occur due to an error in your Galaxy S21’s saved connection settings. This could be caused by a change in the router’s configuration or a simple glitch in your device’s WiFi settings. 

The easiest way to fix this is by forgetting the router on your device and connecting again. Doing this will clear the saved settings and allows your device to establish a fresh connection.

Here’s how you can do this:

  1. Open the Settings menu.
  2. In the Settings menu, tap on Connections.
  3. Under the Connections menu, tap on WiFi.
  4. You will see a list of available networks. Find the network you’re having issues with, and tap on it.
  5. On the next screen, tap on Forget.
Forget wifi network
  1. After forgetting the network, you can reconnect to the router again.

Fix 03: Check If the WiFi Router has Reached Its Max Connections

Most routers have a limit on the number of devices that can be connected at the same time. When this limit is reached, any new device trying to connect will receive a “connection failed” message.

However, if your Galaxy S21 is the only device you’re trying to connect to the router, this may not be the issue. This fix is relevant if you’re in a household or office with multiple devices connecting to the same WiFi network.

Since we cannot provide exact steps to do this (settings may vary depending on the router model and brand), here’s a general guide on how to check if your router has reached its maximum connections:

  1. Open a web browser on a device that is already connected to that WiFi network.
  2. Enter the IP address of your router into the address bar. This is typically something like “” or “”.

    If you’re unsure, check the label on your router or refer to its manual to get this.
  3. Once you visit the router’s control panel using the IP address, you’ll be asked to enter your username and password.

    If you haven’t changed these from the default settings, they should also be listed on your router or in its manual.
Router dashboard
  1. Once logged in, look for a section labeled “connected devices”, “device list”, or something similar. This will show you all the devices currently connected to your network.
  2. Count the number of devices. If it’s close to or at the limit specified in your router’s specifications, you may need to disconnect some devices before you can connect your Galaxy S21.

Fix 04: Reset the Router

Reset the router

Resetting your router is another best solution to the ‘WiFi Connection Failed’ issue. This is because your router may have certain rules or blocked devices that are preventing your Galaxy S21 from connecting. 

By resetting the router, you are wiping these rules, which resolves any connectivity issues.

Here’s how to reset your router:

  1. Locate the reset button on your router. This is usually a small button that you’ll need a pin or paper clip to press.
  2. Press and hold the reset button for about 10-15 seconds while connected to the power source. You should see the lights on the router start to flash, which indicates that the reset is in progress.
  3. Release the reset button and wait for the router to fully restart. This can take a few minutes, so be patient.
  4. Once the router has restarted, you’ll need to reconfigure it.
  5. After reconfiguring the router, try connecting your Galaxy S21 to the WiFi network again.

Fix 05: Reset Network Settings on Galaxy S21

Resetting the network settings on your Galaxy S21 will erase all network settings on your device, including WiFi settings. It will remove all saved WiFi networks and passwords too. 

So the above solutions didn’t work, do the network reset on your phone to fix the problem.

Here’s how to reset network settings on your Galaxy S21:

  1. Open Settings.
  2. Tap on General management.
  3. Then, tap on Reset.
Reset option samsung
  1. Tap on Reset network settings.
Reset network settings
  1. Confirm.

Once the network settings have been reset, reconnect it to your WiFi network.

Wrapping Up

Seeing the “WiFi connection failed” error on your device when you need it the most can be quite frustrating, but with the help of the solutions provided in this guide, you should be able to resolve it.

If you have any questions or need regarding this guide, feel free to leave a comment below. We will be there to help you out!

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The founder of and the tech nerd of the team. He is specialized in Android/iOS development and web development.

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