Fix #5: Use another browser. If the HTTP 503 error service unavailable remains, you can also try to see if you can access your Roblox game using a different browser.

If Roblox Marketplace is not working or loading and you see If you are having trouble loading Marketplace message, then see this post.

To fix the issue, consider restarting your router, using a different network interface, running a speed test, and checking your browser settings or desktop firewall and antivirus settings.

When you’re trying to play Roblox and keep getting the “Bad Request 400” error, it can put a wrench in your plans.

Because Roblox is played by millions of people every day, if the game suspects you of utilizing unlawful scripts or attempting to hack the game in any way, it will eject you from the lobby and ...