6 Ways to Fix the Roblox Authentication Failed Error 403 on a Windows PC

Error 403 is a gaming issue many players have encountered when they try to join Roblox games. The message for error 403 says, “Authentication Failed… An error was encountered during authentication” A player said this about the issue on the Creator Hub forum, “Whenever I try playing any Roblox game, the error code 403 authentication failed appears.” Players can’t join any Roblox games with their web browsers whenever this error occurs. This is how you can fix the Roblox authentication failed error 403.

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Check the Server Status for Roblox

First, check if there’s any server or service disruption that could be causing the Roblox authentication failed error. To do that, open this Roblox status page. If that page shows there’s any current service disruption, wait until all systems are operational again. That page will usually say “All Systems Operational,” but its status history shows there have been numerous service issues.

The Roblox status page

Change to a Google DNS

Your PC has a default Domain Name System server, which you can change to numerous alternatives. Google could be a faster, more reliable, alternative DNS that switching to could resolve the Roblox authentication failed error for some users. You can change your PC’s DNS server to Google like this.

1. Open Run (it has a Windows logo + R hotkey), input ncpa.cpl, and press Enter to bring up Network Connections.
2. Click the network adapter for your internet with the right button on the mouse to select Properties.
3. Double-click Internet Protocol Version 4 to view IPv4 settings window.
4. Select Use the following DNS server addresses to activate value boxes for that setting.
5. Type an 8.8.8.8 value in the Preferred DNS box.
6. Input 8.8.4.4 for the Alternative DNS server value.
   
   

   The Internet Protocol Version 4 window

7. Click the Validate settings upon exit setting to select it.
8. Select OK in the two windows.

Delete the Roblox Data Folder

Deleting the Roblox data folder is a troubleshooting method players confirm can resolve the Roblox authentication failed error. If you do this, must also reinstall Roblox via your browser. This is how you can erase the data folder for the game.

1. Activate Run, input %localappdata% in the Open box, and click OK.
2. Click the Roblox folder once to select rather than open it.
   
   

   The Roblox folder

3. Next, press the Delete button on Explorer’s command bar or Home tab.
4. Open a browser to go to the Roblox.com site.
5. Select a game and click its Play button.
6. Click Download and Install Roblox when prompted.

Run the Network Adapter Troubleshooter

The Roblox authentication failed error can sometimes be the result of networking issues. Running the Network Adapter troubleshooter might help some users resolve such issues. These are the steps for running the Network Adapter troubleshooter.

1. Open the file finder utility in Windows by clicking the Search box on the taskbar or its magnifying glass.
2. Next, type in the troubleshoot search phrase.
3. Click Troubleshoot settings to access troubleshooting options.
4. Now click Other trouble-shooters in Windows 11 Settings. Or click Additional troubleshooters in Windows 10 Settings.
5. Press Run for Network Adapter in Windows 11 Settings. In Windows 10 Settings, click Network Adapter and Run the troubleshooter.
   
   
   

   The Run the troubleshooter button

6. Select All network adapters inside the troubleshooter.
   
   

   The All network adapters option

7. Click Next to initiate the network troubleshooting.

Log into Roblox With a Different Account

The Roblox authentication failed error can occur because of player hardware account bans. You can work around that by logging into an alternative Roblox account if you have one. This is how you can log into a different account.

1. Open the Roblox Player app (not the website).
2. Click Log Out if you see a banned message like the one below.
   
   

   The Log Out option

3. Next, click Log in to sign into a different non-banned account.

If you don’t have an alternative account, create a new one to sign into. Open this Roblox page and click Sign Up there. Input a username, password, and other details to set up the account.

Allow Roblox Through Windows Defender Firewall

Firewall blocks are a potential cause for the Roblox authentication failed error. So, check if Roblox is allowed through Windows Defender Firewall. You can allow Roblox through the Windows firewall like this.

1. Bring up your Windows search tool.
2. Type Windows firewall in the search box and select the Windows Defender Firewall result.
3. Click Allow an app or feature through Windows Defender Firewall to access those configuration settings.
4. Press Change settings.
   
   

   The Allowed apps window

5. Select the Roblox checkbox in the firewall if it’s not ticked.
6. Click the Private and Public checkboxes for Roblox if they’re not selected.
7. Select OK to apply the new firewall options.

Those potential solutions will usually fix the Roblox authentication failed error on Windows 11/10 PCs. They might not work for everyone, but they’re widely confirmed troubleshooting methods for this gaming issue. If you need more possible fixes for this error, try contacting the Roblox help service from this support page.