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Errors & Fixes

Roblox Error Code 279 — Connection Attempt Failed

2 min read Updated

Error 279 (sometimes shown as ID = 17 or "connection attempt failed") means your Roblox client could not establish or maintain a connection to a game server. It's almost always a network or security-software problem on your side, not a Roblox outage.

What causes error 279

The most common triggers, in order of how often they're the culprit:

  • Firewall or antivirus blocking RobloxPlayerBeta.exe.
  • Slow or unstable internet, especially while a game is downloading assets.
  • School, work, or hotel Wi-Fi that blocks game traffic.
  • Corrupted browser data when launching from a browser.
  • An out-of-date Roblox client.

Step-by-step fix

Try these in order. Stop when the game loads.

  1. Restart Roblox and try a different game to confirm the error isn't specific to one place.
  2. Switch browsers — if Edge fails, try Chrome or Firefox, and vice versa.
  3. Disable any VPN, proxy, or DNS-changing tool.
  4. Reboot your router and wait two minutes before trying again.
  5. Allow Roblox through Windows Defender Firewall (Settings → Privacy & security → Firewall & network protection → Allow an app).
  6. Reinstall Roblox after deleting the local Roblox folder.

If you're on a managed network

School, library, and corporate networks often block UDP traffic on the ports Roblox uses (49152–65535). You won't be able to fix this from your device — switch to mobile data or your home Wi-Fi.

If it only happens in one game

Some games crash on join when their place file is broken. Wait an hour and try again, or post in that game's community to see if others are affected.

Common mistakes

  • Reinstalling Roblox before checking the firewall — the firewall block survives reinstalls.
  • Trying to bypass a school network with VPNs — most managed networks block VPNs too.

Frequently asked questions

Does error 279 mean I'm banned?
No. Ban messages are explicit. 279 is a connection error, not a moderation action.
Why does error 279 only happen on my Wi-Fi?
Either the router is dropping UDP packets or the network has filtering enabled. A router reboot fixes the first; only network administrators can fix the second.
Can a slow connection cause error 279?
Yes. If the initial handshake times out, Roblox shows 279. Test at speedtest.net — anything under 3 Mbps with high jitter is risky.
Why does Roblox use UDP and not just TCP?
UDP is faster for real-time games. The downside is that some restrictive networks block it, which is exactly the scenario that causes 279.
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