🧱Roblox
Error Code 272

Fix Roblox Error Code 272: "Security Key Mismatch"

Disconnected with "Security Key Mismatch"? Roblox detected that your game client was modified. This is commonly caused by R-shade and other client mods. Here's how to fix it.

📊 Beginner ⏱️ 5 min fix ✅ 90% success rate

🔍 The Diagnosis

This error shows the message: "Disconnected: Security Key Mismatch."

What causes this error?

  • ⚠️ R-shade — a visual mod that makes Roblox graphics look "shiny"
  • ⚠️ Exploit tools or DLL injectors that modify the game client
  • ⚠️ Corrupted Roblox installation files
  • ⚠️ Running Roblox with modified launch parameters

🛠️ The Fix

Follow these steps to fix the security key mismatch:

1

Remove R-shade / ReShade

R-shade is the #1 cause of Error 272. It's a visual mod that injects custom shaders into Roblox, making everything look glossy and reflective. While it looks cool, it modifies the game client — which triggers the security key mismatch.

To remove R-shade:

  1. Open the R-shade uninstaller (if you have one)
  2. Or manually delete the ReShade DLL files from your Roblox folder
  3. Check %localappdata%\Roblox\Versions for any modified files
2

Remove All Client Modifications

Remove any other tools that modify the Roblox client:

  • Exploit scripts (Synapse, KRNL, Fluxus, etc.)
  • FPS unlockers — some versions modify game files
  • Custom Roblox launchers or modified executables
3

Clean Reinstall Roblox

After removing all mods, do a clean reinstall:

  1. Uninstall Roblox from your computer
  2. Press Win + R, type %localappdata%, press Enter
  3. Delete the entire Roblox folder
  4. Restart your computer
  5. Download and install Roblox from roblox.com
✓

Problem Solved! 🎉

Error 272 should be gone. Your Roblox client now has the correct security keys. Don't reinstall R-shade or any client mods — they'll cause the same error again.

Frequently Asked Questions

❓ Is R-shade safe to use on Roblox?

No. While R-shade doesn't steal your data, it modifies the Roblox client which violates their Terms of Service. You'll get Error 272 and repeated use can lead to bans.

❓ What's the difference between Error 272 and Error 268?

Error 272 is specifically about security key mismatch (modified files), while Error 268 is about unexpected client behavior (detected exploits at runtime). Both are anti-cheat responses. Read about Error 268 →

💬 Need More Help?

Check our fake vs real Roblox errors guide or contact us.

Related Roblox Fixes