How to Troubleshoot and Fix HTTP 400 Client Error in Roblox

The HTTP 400 client error, also known as the “HTTP 400 Bad Request” error, is a common issue that Roblox players may encounter. This error prevents you from loading into games and servers in Roblox.

Fortunately, there are several troubleshooting steps you can take to resolve this error on your end. This article provides a step-by-step guide to troubleshooting and fixing the HTTP 400 error in Roblox.

What Causes the HTTP 400 Error in Roblox

The HTTP 400 client error typically occurs due to the following reasons:

Server Issues

Problems with the Roblox servers are the most common cause of this error. Server outages or maintenance can prevent players from connecting to games.

Internet Connectivity Issues

Issues with your own internet connection can also lead to the HTTP 400 error. Problems like temporary connection drops, DNS issues, or using a VPN/proxy can trigger this error.

Outdated Game Client

Having an outdated version of the Roblox game client may also be the culprit behind HTTP 400 errors. Keeping your game up-to-date is important.

How to Fix HTTP 400 Error in Roblox

Here are the steps you should take to troubleshoot and resolve the HTTP 400 error in Roblox:

1. Check Roblox Server Status

First, check if the problem lies with the Roblox servers. Visit the Roblox Server Status page to see if there are any ongoing issues or outages.

If the servers seem up and running, the problem likely lies on your end.

2. Reset Your Internet Connection

Try resetting your internet connection first.

On Windows, open Command Prompt as Administrator and run the commands:

ipconfig /flushdns
ipconfig /registerdns
ipconfig /release 
ipconfig /renew
netsh winsock reset

On Mac, open Terminal and enter:

killall -HUP mDNSResponder
sudo killall mDNSResponderHelper
sudo dscacheutil -flushcache
sudo discoveryutil mdnsflushcache
sudo discoveryutil udnsflushcaches

After running these commands, reconnect to the internet and try loading Roblox again.

3. Clear Your Roblox Cache

Clearing cached files can also help resolve connectivity issues.

On Windows, delete all files inside C:\Users\YOUR_USERNAME\AppData\Local\Roblox\.

On Mac, delete files in ~/Library/Application Support/Roblox/.

4. Update Your Roblox Client

Check if you are running the latest version of the Roblox game client. Update to the newest version if needed.

5. Try Using a VPN

As a last resort, consider connecting to a VPN to change your network route. Using a VPN assigns you a different IP address which may bypass any connectivity issues.

Preventing HTTP 400 Errors

Here are some tips to avoid HTTP 400 errors in the future:

  • Monitor the @RobloxStatus Twitter account to stay updated on any server issues
  • Run regular speed tests to check for potential internet problems
  • Set Roblox to automatically update itself in Settings > General
  • Try using an Ethernet cable for faster and more reliable connectivity
  • Consider upgrading your internet plan if you frequently disconnect


The HTTP 400 client error can be frustrating but is often easy to resolve on your end. First check the server status, then try resetting your network connection, clearing Roblox cached files, updating your client, or connecting using a VPN.

Following the troubleshooting steps outlined in this guide should help you get Roblox back up and running quickly. Let us know if the solutions provided helped fix your HTTP 400 error!