How To Fix Roblox Error Code 400 [Updated 2023]

Roblox is a well-known online gaming platform that allows users to create and play games with other players from all over the world. Unfortunately, when attempting to access the game, players may face problems. 

One such problem is the Roblox error code 400, which occurs when the user’s computer is unable to connect to the Roblox game server. This error might be irritating, but there are several steps you can take to fix it. In this post, we will go over some of the methods you can take to resolve the bad request error code 400 and return to enjoying your favorite Roblox games.

How To Fix Roblox Error Code 400

Roblox is a popular online game platform that has grown in popularity over the years. Unfortunately, players may encounter problems when attempting to access the game. The bad request error code on Roblox is one such example. This error happens when the user’s computer is unable to connect to the Roblox game server, preventing players from entering the game. 

It can be annoying to discover such problems, but there are troubleshooting methods you can take to address the problem. In this post, we will look at some of the most effective methods to resolve the Roblox error message and return to enjoying your favorite Roblox games. We will go through each step in depth, and we hope that by the end of this article, you will have a better knowledge of how to resolve this issue and resume playing Roblox games.

Roblox Error Code 400 feor body 1

Fix #1: Clear Browser’s Cache and Cookies

Deleting your browser’s cache and cookies can help you solve Roblox error code 400 by deleting any old cached data that may be causing connection problems. This restores your connection to the Roblox game server and may help you resolve the error.

Here’s how you do it:

  1. Launch your Google Chrome browser and click the small three dots located at the upper right corner of the screen.
  2. Click Settings.
  3. In the upper-left corner, click Privacy and Security.
  4. Click the “Clear Browsing Data” section.
  5. Adjust the time range to “All time” and be sure to check the three items: Browsing history, Cookies and other site data, Cached images and files.
Clear Browsers Cache and Cookies

Fix #2: Check your Internet Connection and Network 

Checking your internet connection can help you fix Roblox error code 400, as a weak or unstable internet connection can cause network issues with the Roblox game server. By verifying your internet connection, you may find any problems and resolve them to ensure a strong and stable connection to the game server. This will allow you to access the game without encountering any issues.

How to check your internet connection on PC

  1. Open a web browser.
  2. Go to speedtest.net or fast.com and run a speed test.
Check your Internet Connection and Network

Here’s how to check your network:

  1. Click the magnifying glass icon and type “Control Panel.
  2. Under Network and Internet, click “View network status and tasks.”
  3. Look for “Change adapter settings” and click on it.
  4. Right-click on Wi-Fi or Ethernet and click Diagnose to detect any issues.

Fix #3: Run Windows Diagnostics Troubleshooter

Running Windows Diagnostics Troubleshooter might help you fix Roblox Error Code 400 by identifying and resolving any issues with your computer’s network settings or connectivity. The troubleshooter can identify and resolve issues with network adapter settings, DNS server settings, and other network-related issues that may be generating the error. 

You can use the troubleshooter to confirm that your computer’s network settings are correct and to improve your connection to the Roblox game server. This may help to resolve the error and allow you to play the game normally.

Here’s how to access Windows troubleshooter:

  1. To begin, click Start.
  2. Click Windows Settings.
  3. Click Update & Security.
  4. On the left pane, click Troubleshoot.
  5. Click Additional troubleshooters to open troubleshooter tools in Windows 11.
Run Windows Diagnostics Troubleshooter

Fix #4: Allow Roblox on Windows Defender Firewall

The firewall or antivirus settings may be preventing the connection between your computer and the Roblox game server, which might lead to error code 400. By inspecting your firewall and antivirus settings, you may discover if they are causing the problem and tweak them so that Roblox can connect to the internet. This can help with resolving the error and allowing access to the game.

Here’s how to create Windows Firewall rules:

  1. From the search bar, type “Windows Security.”
  2. On the left pane, look for “Firewall & network protection.”
  3. Click the “Allow an app through firewall” option.
  4. Click the “Change settings” button.
  5. Find Roblox and choose if you want to set it to “Private” or “Public.”
  6. Click the OK button.
Allow Roblox on Windows Defender Firewall

Fix #5: Change your DNS

Changing your DNS (Domain Name System) can help you fix Roblox Error Code 400 by making your internet connection more stable and faster. DNS is in charge of turning domain names into IP addresses and connecting your computer to the internet. 

You can use a more reliable and faster DNS server by changing the DNS settings on your computer or router. This can make your internet connection faster and more stable. This can help you get a better connection with the Roblox game server and make it less likely that you’ll get errors like Code 400.

This is how to change your DNS:

  1. Click the magnifying glass icon and type “Control Panel.”
  2. Click on “Network and Internet.”
  3. Click “Network” and “Sharing Center.”
  4. On the left side, click Change Adapter Settings.
  5. To change the settings of your Ethernet connection, right-click Ethernet and select Properties.
  6. On the Networking tab, under This connection uses the following items, click the Internet Protocol Version 4 (TCP/IPv4) option.
  7. Click the Properties button.
  8. Under the “Use the following DNS server addresses’ ‘ enter 8888 pm Preferred DNS server and 1111 on Alternate DNS server.
  9. Click the OK button.
  10. Click the “Close” button.
Change your DNS

Fix #6: Contact Roblox Support

Roblox error code 400 can be resolved by contacting customer service, since they can provide more thorough troubleshooting instructions and assist you in determining the source of the problem. If none of the basic troubleshooting procedures work, Roblox support can provide detailed instructions and assistance to help you fix the error so you can resume enjoying the game. 

Also, they can identify any known difficulties with the Roblox servers or your account and assist you in resolving them as quickly as possible.

Contact Roblox Support


  1. What causes Roblox Error Code 400?

    Roblox Error Code 400 can be triggered by a variety of factors, connection issues, outdated browser settings, issues with the user’s firewall or antivirus settings, and interference from VPN or proxy servers. The issue could potentially be caused by Roblox’s security measures, which may block connection to the game server or server status if any suspicious or unauthorized activity is detected. 

    The problem may also be caused by server-side issues or maintenance work on the Roblox platform in some situations. Understanding the core cause of the problem can help you figure out the most effective way to solve the problem and resume playing the game.

  2. How do I fix Roblox Error Code 400?

    Roblox Error Code 400 can be resolved by doing some simple troubleshooting procedures. Some of the steps that you can take include clearing your browser’s cache and cookies, disabling your ad-blocker, testing your internet connection, and checking your firewall or antivirus settings. 

    You can also try turning off your VPN or proxy and using a different browser. If the problem persists, contacting Roblox support may be of assistance. You may resolve Roblox Error and resume playing the game by determining the root cause of the problem and taking the necessary measures to address it.

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