Understanding League of Legends Error Code 2005
Error Code 2005 in League of Legends presents as an instantaneous disconnect immediately upon entering the loading screen — the client connects to the matchmaking queue, receives a game assignment, and then immediately severs the connection before champion selection completes. This error is almost exclusively caused by a corrupted session token cached by the League client, or by the client’s HTTP/2 connection multiplexing colliding with ISP-level packet inspection.
Root Cause: League Client’s Session Token Expiration
When the League client authenticates, Riot’s auth server issues a session token valid for a specific duration. If the client’s system clock (RTC) drifts more than 5 minutes out of sync with Riot’s NTP servers, the token validation fails at the game server’s handshake stage. The server interprets the invalid token as a security anomaly and terminates the connection with Error 2005 before champion selection loads.
Resolving the Session Token Collision
Synchronizing System Clock with Riot’s NTP Servers
Open Settings → Time & Language → Date and Time → Additional date, time & regional settings → Date and Time → Internet Time → Change Settings. Check Synchronize with an internet time server and click Update now. If the synchronization fails, manually set the time and date to the correct values, then retry. The League client requires a maximum time drift of ±300 seconds — anything beyond this triggers the token validation failure.
Clearing League Client’s Network Cache
Close the League client completely. Press Win+R, type %LeagueClientInstallPath% (typically C:Riot GamesLeague of Legends), and navigate to the Config folder. Delete the player.local.yml file — this contains cached session tokens. Additionally, navigate to %AppData%Riot GamesLeague of Legends and delete the config and lockfiles folders. Restart the client, which will regenerate fresh session tokens from Riot’s authentication servers.
Bypassing ISP Packet Inspection for League Traffic
Some ISPs implement deep packet inspection (DPI) that examines HTTP/2 headers in League’s outbound traffic. When the DPI classifies the traffic pattern as anomalous (a common occurrence during peak hours), it drops the packets, causing the game server to interpret the client as unresponsive and disconnect with Error 2005. To resolve, launch the League client with the --riot-client-api=1.1 launch option, which forces the client to use HTTP/1.1 with plaintext headers that DPI systems typically allow to pass.
Checking League Server Status
Before attributing Error 2005 to a local issue, search “is Roblox down right now”-style queries for League: “is League of Legends down right now” returns live status from Riot’s global infrastructure dashboard. If your region shows elevated latencies or an active incident, Error 2005 is server-driven and no client-side fix will resolve it until Riot resolves the infrastructure issue.
Call to Action
Use the webs.ninja status engine to run a pre-game connection test that verifies your client can complete the full handshake sequence with League’s game servers. If the status engine reports a handshake timeout, the issue is on Riot’s infrastructure side; if the handshake succeeds in the diagnostic but fails in-game, the issue is local — likely a stale session token or clock drift as described above. Running the diagnostic first ensures you apply the correct fix for your specific situation.