That specific code (“9S 6U” or sometimes written “9u6” / “6u error”) is a connection or patching error. It usually means the League client can’t communicate properly with Riot’s servers, often due to network, DNS, or corrupted client data issues.

Here’s how to fix it step by step:

🧰 1. Restart everything

• Restart your PC and router/modem.

• Then relaunch the Riot Client.

🌐 2. Check your Internet & DNS

• If you’re on Wi-Fi, try a wired connection.

• Flush DNS cache:
  Windows:

  1. Press Win + R, type cmd, press Enter.

  2. Run:

     ipconfig /flushdns


  Mac:

  sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder


• Optionally, set DNS to Google (8.8.8.8 and 8.8.4.4).

Also Read : Aplikasi Ajaib Error | Login Ajaib Error Hari Ini

🔧 3. Run League as administrator

Right-click the Riot Client → “Run as Administrator.”

🧹 4. Repair the client

1. Open the Riot Client.

2. Click your profile icon → Settings → League of Legends → Repair.
   It will re-download any corrupted files.

🔥 5. Check firewall / antivirus

• Make sure RiotClientServices.exe and LeagueClient.exe are allowed through your firewall.

• Some antivirus programs (like Avast or AVG) block Riot’s network traffic; try disabling them temporarily.

🧩 6. Reinstall (if nothing works)

Uninstall both Riot Client and League of Legends, then reinstall from the official Riot site.

For UK Regions

For the UK region (England), here’s what I found regarding League of Legends and the error code you mentioned (9S 6U):

✅ Server Status

• According to third-party trackers, the servers are currently reported as “up”.

• However, there have been recent reports of connection issues / lag on the EUW region (which UK players use) likely related to network routing or DDoS-type effects.

• So while there might not be an official full outage, your error could stem from network issues rather than the game being entirely down.

⚠️ What the error code means

The error code 9S 6U is described as a connection/authentication failure between your client and the game servers (or authentication servers) according to articles.

Common causes:

• Network instability / packet loss

• VPNs or proxies interfering

• Firewall/antivirus blocking required ports

• Corrupted client or anti-cheat software (Riot Vanguard) malfunctioning

🔧 What you can try (in England / UK)

Given your region and situation, I recommend the following targeted steps:

1. Check your network

   • Use a wired connection if possible instead of WiFi (reduces packet loss).

   • Flush DNS: open CMD as admin → ipconfig /flushdns and netsh winsock reset then reboot.

   • If you’re using a VPN or proxy, disable it and try again.

2. Check firewall/antivirus settings

   • Make sure League of Legends, Riot Client, and Riot Vanguard are allowed through the firewall.

   • Temporarily disable antivirus to test if that’s blocking the connection.

3. Repair game client / Riot Vanguard

   • In the Riot Client, go to Settings → League of Legends → Repair (or equivalent).

   • Uninstall Riot Vanguard and let the client reinstall it (this often helps authentication issues).

   • If necessary, reinstall the entire game.

4. Router-ISP check

   • Some UK ISPs have known routing issues to Riot servers. For example:

     “My ping is stuck at roughly 60ms to the London server… compared to around 10ms a few months ago.”Contact your ISP if you suspect your route to the game servers is degraded.

5. Check official updates / wait it out

   • Sometimes the issue is on Riot’s side (or upstream network) and you simply need to wait.

   • Follow Riot Games and @RiotSupport on Twitter for server-status alerts.

   • Use server status websites (third-party) to see if others in your region are being affected.