Roblox uses Cloudflare for its web infrastructure. A 520 error means Cloudflare received an invalid response from Roblox's origin servers — typically during outages, rapid traffic spikes, or backend deployments. Players usually see this on the Roblox website rather than in the game client.
What does Roblox Error 520 mean?
HTTP 520 is a Cloudflare-specific error code for an unknown error. It appears when the Roblox web server returns a response that Cloudflare cannot interpret — a crash response, an empty reply, or malformed data. This is a Roblox infrastructure issue, not a user-side problem.
When does it appear?
Error 520 most often appears when loading Roblox.com during or immediately after a Roblox outage, when their backend services restart, or during traffic spikes around major game releases.
Does it affect gameplay?
If you were already in a game when 520 appeared on the website, your session should be unaffected. The error blocks web page loads — it does not kill live game sessions. However, launching a new game from the website will fail until the 520 clears.
How to fix step by step
- 1Wait a few minutes and refresh — Error 520 usually resolves once Roblox restores its backend.
- 2Check Roblox server status for an active outage or incident.
- 3Clear your browser cache and cookies, then reload Roblox.com.
- 4Try a different browser to rule out browser-level caching.
- 5Disable VPN — some VPN exit nodes have Cloudflare challenges that exacerbate 520.
- 6If the game client itself is showing 520, restart the client and try again after a few minutes.