Roblox Error Code 272, disconnected for a security key mismatch
Error code 272 means Roblox disconnected you because your client failed a security check, shown as a security key mismatch. It is Roblox's anti-cheat protection reacting to something running alongside the game, most often exploit software, but it can also be triggered by interfering programs or an unstable connection.
The fix, in order
Close any exploit, cheat, or mod software before launching Roblox. This is the most common trigger, and the error will keep appearing while such software is running, even in the background.
Run only the official Roblox client. Do not launch through third-party launchers, modified clients, or injected tools, since those fail the same security check.
Disable browser extensions that interact with Roblox. Extensions that modify Roblox pages or inject scripts can trip the check, so turn them off and test with a clean browser session.
Close overlays and automation tools. Screen recorders with game hooks, macro tools, and some VPN or proxy apps can interfere, so close them and relaunch Roblox.
Reinstall Roblox from the official source. A clean install removes corrupted or modified client files that can fail validation.
Check your connection. A very unstable connection can corrupt the security handshake, so restart the router and try a wired connection if the error appears without any extra software running.
Do not try to bypass this check. Tools that promise to hide exploits from Roblox are themselves against the rules, and using them can lead to account moderation, including a ban. The only safe fix is to play with a clean, official client.
If it still happens
If 272 appears on a clean install with no extra software running, check for a pending Roblox update and try a different network, such as a mobile hotspot, to rule out a network-level block. If it still appears, the account may have a history that needs a look from Roblox support, and a support ticket is the next step.
Common questions
Is error code 272 a ban? No, 272 itself is a disconnect, not a ban. It does not mean the account is banned, but repeatedly using exploits can lead to separate moderation action on the account.
Can error 272 be a false alarm? Yes. Interfering software, browser extensions, and severe connection instability can all trigger it without any cheating. If a clean install on a stable connection still shows it, that points to something on the device or network.
Does error 272 mean my account was hacked? Not usually. It is about the client on your device failing a security check, not about someone else using the account. A hacked account shows up more often as error 264 or unexpected logins.