How to Fix “Failed to Receive Platform SIPT” in League of Legends?
League of Legends shows “Failed to receive Platform SIPT” when its client cannot retrieve the regional platform data needed to finish loading.
Sign-in may succeed, yet the client can stop before the home screen, lose its lobby connection, or show the message after champion select.
Riot does not publish a definition of SIPT. The error appears during regional incidents and isolated network failures, so it proves neither a wrong patch nor a corrupt installation.
| What you find | What it tells you |
|---|---|
| Several players in your region see SIPT | Riot’s regional service is likely having an incident. |
| Hotspot works; home internet fails on every device | The router, ISP route, or ISP DNS is likely involved. |
| Hotspot works; another PC also works on the home network | Check the affected PC’s network and security settings. |
1. Check Your Region on Riot Service Status, Then Restart the Client Completely
Regional incidents have produced this message before Riot’s status page was updated. Closing every Riot process prevents the launcher from reusing an incomplete session after recovery.
- Open the official Riot Games Service Status page and select the region where your League account plays.
- If an incident mentions login, platform, lobbies, or queues, wait for Riot to clear it. Reinstalling League will not shorten a regional outage.
- If no incident appears, press Ctrl + Shift + Esc and end LeagueClient, LeagueClientUx, and RiotClientServices in Task Manager.
- Open the Riot Client again and let it check for an update before launching League.
If other players in your region recover together, the problem was server-side. If SIPT still appears only on your PC, continue below with the Windows network reset. Do not use local resets while the same regional incident is active.
If the Riot Client remains on Update or Preparing Download, use the focused Riot Client update repair steps instead of treating SIPT as a standalone login failure.
2. Reset Windows’ Network Adapters and Restart the Router
SIPT can survive a restart when Windows keeps damaged TCP/IP, Winsock, or adapter state. Network reset rebuilds the adapters and clears that state; exact-error players confirmed it restored the client.
- Press the Windows key, search for Network reset, and open it. On Windows 11, the same page is under Settings > Network & internet > Advanced network settings > Network reset.
- Select Reset now, confirm the reset, and allow Windows to restart.
- After the PC shuts down, disconnect power from the modem and router for about one minute. Reconnect them and wait until the internet connection is fully restored.
- Open Riot Client and test League before restoring any custom network software.
If League loads now, damaged Windows or router state was the problem. If SIPT still appears, continue below with the clock and security checks. Do not use Network reset on another PC unless it also fails independently.
3. Sync the Windows Clock and Restore Modern Security Protocols
Login fails when the clock is wrong or modern TLS is disabled. Correcting both settings restores Windows’ ability to validate Riot’s certificate and finish the encrypted session.
Riot’s login troubleshooting includes both checks for non-credential failures. Do not use these changes on an employer-managed PC; ask its administrator instead.
- Open Settings > Time & language > Date & time. Turn on Set time automatically, confirm the time zone, and select Sync now.
- Press Windows + R, enter inetcpl.cpl, and press Enter.
- Open the Advanced tab and scroll to Security.
- Leave SSL 3.0, TLS 1.0, and TLS 1.1 unchecked. Make sure TLS 1.2 and TLS 1.3 are checked when they appear.
- Select Apply > OK, restart Windows, and reopen League.
Older guides enable TLS 1.0 and 1.1.
Microsoft recommends leaving those legacy protocols disabled.
League should use TLS 1.2 or newer on a current Windows installation. Keep a screenshot of the original Internet Options as your rollback reference.
If League loads after the restart, Windows had rejected the secure connection. If SIPT still appears, continue below with the hotspot comparison.
4. Test the Client Through a Phone Hotspot
The client fails when one connection cannot reach Riot. A hotspot isolates it by replacing the ISP, public IP, DNS, and router without changing League.
- Turn on your phone’s Mobile Hotspot and disconnect the PC from its normal Wi-Fi or Ethernet connection.
- Connect the PC to the hotspot, open Riot Client, and launch League.
- If the client reaches its home screen, close it normally and reconnect the PC to the home network.
- Open League once more on the normal connection.
If every home-network device fails but the hotspot works, apply the DNS change below and contact the ISP if needed. If another PC works through the same router, focus on this Windows installation and its firewall.
Avoid a full match over mobile data unless your plan and signal support it. If SIPT also appears on the hotspot, continue below with the local checks.
5. Check OneDrive’s Network Use Before Pausing It
The client can fail when a heavy OneDrive transfer consumes a limited connection. Pause OneDrive only if Task Manager shows that activity. This prevents bandwidth contention; it does not repair League files.
- Open Task Manager, sort the process list by Network, and check whether OneDrive is transferring data heavily.
- If it is, select the OneDrive cloud icon, open its menu, and choose Quit OneDrive or pause syncing temporarily.
- Test League once, then reopen OneDrive afterward.
Do not unlink OneDrive or delete synced files. If League loads after pausing an active transfer, bandwidth contention was the problem. If SIPT remains or OneDrive was idle, continue below with DNS.
6. Replace the ISP’s DNS and Clear the Old DNS Cache
Riot notes that League can fail when ISP DNS cannot resolve its aliases. Public DNS prevents that lookup failure. Change DNS only if you record existing custom addresses first.
- Press Windows + R, enter ncpa.cpl, and press Enter.
- Right-click the active Wi-Fi or Ethernet adapter and choose Properties.
- Select Internet Protocol Version 4 (TCP/IPv4), then select Properties. Do not disable IPv6 for this test.
- Record any existing custom addresses. Select Use the following DNS server addresses and enter Google’s official public DNS values:
Preferred DNS server: 8.8.8.8 Alternate DNS server: 8.8.4.4
- Select OK. Open Command Prompt as administrator, run
ipconfig /flushdns, and restart Riot Client.
The addresses above are documented by Google Public DNS. Your recorded values are the rollback reference.
If League loads now, DNS resolution was the problem. If SIPT still appears, restore Obtain DNS server address automatically and continue below with firewall exceptions.
7. Check Firewall Exceptions for Riot and League
When one PC fails on every network, security software can block Riot’s request. Explicit exceptions prevent that without disabling the firewall. Do not use guessed paths; add only files present on your PC.
- Search Windows for Allow an app through Windows Firewall and open it.
- Select Change settings > Allow another app > Browse.
- Add the Riot and League executables that exist in your installation. Riot’s current connection guide lists these default paths:
C:\Riot Games\League of Legends\LeagueClient.exe C:\Riot Games\League of Legends\LeagueClientUx.exe C:\Riot Games\League of Legends\LeagueClientUxRender.exe C:\Riot Games\League of Legends\Game\League of Legends.exe C:\Riot Games\Riot Client\RiotClientServices.exe
- Allow them on Private networks. Enable Public only if Windows classifies the trusted connection you actually use as Public.
- If you use a third-party firewall or antivirus with web filtering, add the same files to its application exceptions and keep protection enabled.
If League loads after adding the exceptions, a firewall rule was blocking the client. The rollback is to remove only the rules you added. If SIPT still appears on both connections, continue below and send Riot the client logs.
If the SIPT Error Still Appears
A persistent error across the home network and hotspot needs client logs rather than more speculative changes. Do not use registry cleaners, disable the router firewall, or turn on obsolete TLS versions.
If the League window never opens far enough to show SIPT, use the separate League client launch guide instead.
Zip C:\Riot Games\League of Legends\Logs\LeagueClient Logs, then attach it to a Riot Support ticket.
Include your region, ISP, hotspot result, when the message appears, and whether another account or PC behaves differently. Those details help Riot distinguish a regional incident, ISP route failure, and single-client fault.
