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League of Legends error

"You may be offline": a Killer network setting is blocking the League login

League clientLogin

The message

You may be offline

What it means

Riot links this login error to PCs with a Killer Network wireless adapter, where one of Killer's own options gets between League and your connection.

What to try first

Open the Killer Network app, go to Settings and untick Enable Advanced Stream Detect, then log in again.

Is it you or Riot? If lots of players are hitting this at once, it's probably the servers. Check League server status before you start reinstalling things.

Check for a Killer adapter first

Riot mentions this message once, near the end of a long general article on League login problems, and it attaches it to one piece of hardware. If your PC uses a Killer Network wireless adapter, a feature called Advanced Stream Detect is switched on out of the box. It tries to hand bandwidth to particular apps and streams first, and Riot says that can clash with League's connection. The login then fails with this line.

  1. Press the Windows key and type Killer.
  2. Open the Killer Network Suite app. Its name depends on the version: look for Killer Control Center or Killer Network Manager.
  3. In Settings, untick Enable Advanced Stream Detect.
  4. Close the Killer app, open the League client and log in.

Riot's separate Killer guide covers switching off the Killer Network Service itself.

No Killer adapter? Riot's general login checks

The rest of the article covers any login error that isn't about your username or password (for those, Riot points you to account recovery), plus logins that time out. Parts of it are old: the Windows steps still lean on Internet Explorer, which Riot says the client relies on there (whatever your default browser is).

Region. Before pressing Play, look at the region in the top right of the client. An account only lives in one region at a time, so log in to the one it's on.

Server status. Check whether League's servers are up for your region before changing anything on your PC. Our League server status page does this.

The Windows clock. Riot says a clock that's drifted sends League's servers certificates with the wrong timestamps, which can affect logging in, the store and matches. Right-click the taskbar clock, choose Adjust date/time, open Internet Time, click Change settings and then Update now. If that fails, open Command Prompt and run these two lines, pressing Enter after each:

net start w32time
w32tm /resync

If the resync still fails, set the date and time by hand.

DNS. Some internet providers' DNS servers have trouble with the server names League uses, and Riot says this mostly affects players outside the US. Switch your network adapter to a public DNS (Riot's article uses 8.8.8.8 and 8.8.4.4), run ipconfig /flushdns from an administrator Command Prompt, then restart. Write down your old settings first in case you need them back.

Security protocols. If Windows is set to use the old SSL 2.0 and 3.0 protocols first, the client can fail to connect. Search Windows for Internet Options, open the Advanced tab, scroll to the security section, untick both SSL boxes, tick TLS 1.0, apply and restart League. The article asks for TLS 1.1 and 1.2 to be on as well.

Riot also mentions its Hextech Repair Tool for Windows as a way to clear a few common login blockers. On a Mac, the article's extra steps are allowing cookies in Safari and installing macOS updates.

Other wordings of the same error

  • You may be offline League
  • League client you may be offline
  • LoL you may be offline error
  • You may be offline login error

Source: Riot Games Player Support, Login Issues, updated May 27, 2026. Riot's steps are paraphrased here, not copied; checked September 29, 2026.