Failed To Receive Platform SIPT League of Legends

December 5, 2025 Freddy Error Fix 0

The “Failed to receive platform SIPT” error in League of Legends is almost always a connection handshake issue. The “SIPT” refers to a protocol the game uses to establish a connection with the login servers.

When this fails, it usually means your ISP, router, or firewall is blocking that specific signal.

Here is a step-by-step guide to fix it, ordered from the easiest to the most effective technical solutions.

Phase 1: Quick Fixes (Try these first)

1. Check Server Status

Before troubleshooting your PC, ensure Riot’s servers aren’t down.

  • Go to the Riot Games Service Status page.

  • If you see issues with “Login” or “Platform,” you just have to wait it out.

2. The Mobile Hotspot Test (Diagnostic)

This is the fastest way to confirm if the issue is your home network/ISP.

  • Disconnect your PC from your home Wi-Fi/Ethernet.

  • Enable a hotspot on your phone and connect your PC to it.

  • Try to log in to League.

  • Result: If it works on the hotspot but not your home internet, the issue is definitely your router or ISP blocking the SIPT protocol. Proceed to Phase 3 for the permanent fix.

Phase 2: PC Configuration Fixes

1. Change DNS Settings

Your ISP’s default DNS might be failing to resolve the SIPT server address.

  • Press Windows Key + R, type ncpa.cpl, and hit Enter.

  • Right-click your active network adapter (Wi-Fi or Ethernet) > Properties.

  • Double-click Internet Protocol Version 4 (TCP/IPv4).

  • Select “Use the following DNS server addresses” and enter:

    • Preferred: 8.8.8.8 (Google)

    • Alternate: 1.1.1.1 (Cloudflare)

  • Click OK, then open Command Prompt (cmd) and type ipconfig /flushdns.

2. Allow League Through Firewall

Windows Defender might be treating the connection attempt as a threat.

  • Press Windows Key, type “Allow an app through Windows Firewall”, and open it.

  • Click Change settings.

  • Scroll down to League of Legends (you might see LeagueClient.exe or League of Legends (TM) Client).

  • Ensure both “Private” and “Public” boxes are checked.

  • Click OK.

3. Disable “Killer Intelligence Center” (If applicable)

If you have a gaming motherboard (MSI, Alienware, etc.) with a “Killer” network card:

  • Open your Task Manager (Ctrl+Shift+Esc).

  • Look for “Killer Intelligence Center” or “Killer Network Service”.

  • Right-click and End Task.

  • Note: If this works, you should uninstall this software permanently as it is a known cause of this error.

Phase 3: Router Settings (The “SIPT” Specific Fix)

If the above didn’t work, your router is likely blocking the specific packet type using a feature called SIP ALG.

Disable SIP ALG

  • Log in to your router settings (usually by typing 192.168.0.1 or 192.168.1.1 into your browser).

  • Look for a tab named WAN, Advanced, or Firewall.

  • Find an option called SIP ALG, SIP Passthrough, or Application Layer Gateway.

  • Disable (uncheck) it.

  • Save settings and restart your router.

Why this helps: SIP ALG is designed to help VoIP phones, but it often corrupts game traffic that uses similar protocols (like League), causing the “failed to receive” error.

Phase 4: The Workaround

If you cannot access your router settings (e.g., university internet or locked ISP router), use a VPN.

  • Connecting to a VPN bypasses the local network’s filtering of SIPT packets.

  • Connect to a location near you to minimize ping, then launch the client.

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