Incident History
Key outages, maintenance windows, and account-impact incidents over time
Cabinet-side cookie swallowing caused intermittent disconnects and penalty locks
Affected Scope
Intermittent nationwide impact
Duration
Ongoing
Root Cause
After the 1.53 maintenance, a new cookie validation flow was introduced. Missing or invalid cookie delivery occasionally prevented proper logout and triggered penalty state
Resolution
Power-cycling the cabinet may help temporarily. Existing penalty unlock tricks no longer work; a fundamental fix requires SEGA-side action
Nationwide cabinet outage: Error 0949
Affected Scope
All cabinets nationwide
Duration
Several hours on 3/2, then gradually recovered that night
Root Cause
SEGA-side changes to the bl server caused failures on all bl-dependent cabinets
Resolution
Power-cycling cabinets restored service. Refund entries in NET recharge records indicate normal recovery
Error 8103/8106: ALL.Net billing storage overflow
Affected Scope
Cabinets nationwide
Duration
Started on 2/25, lasted for several days, and spread over time
Root Cause
Server-side changes prevented cabinet billing records from uploading and clearing, filling storage until 8106 warning escalated to 8103 lockout
Resolution
8106 warning can be muted via NET recharge records. 8103 needs a SEGA patch or server-side receiving fix
Chime servers hit by CC + TCP Flood DDoS, nationwide grey-network outage
Affected Scope
All players nationwide
Duration
2026-01-11 to 2026-01-16, approximately 5 days
Root Cause
Attackers simultaneously launched CC attacks against all three Chime servers and TCP Flood against the Title server, causing handshake timeouts (measured at 11046ms) and mass connection drops — more severe than any previous attack in 2024
Resolution
Restored on 2026-01-16, domestic network stability recovered
Emergency full-service maintenance with 7-day online shutdown
Affected Scope
All players across the service
Duration
2025-12-22 22:00 to 2025-12-29 14:00 (about 7 days)
Root Cause
No official root cause disclosed; maintenance around 1.53 was widely suspected
Resolution
Service reopened at 14:00 Beijing time on Dec 29; the Dec 24 music update was postponed
Mass account-scanning attack and full-server invoice abuse
Affected Scope
All players across the service
Duration
From afternoon of 2025-09-06 to 21:00 on 2025-09-07 (about 30 hours)
Root Cause
Attackers abused fixed UserID patterns to trigger invoice spam at scale and force accounts into the penalty state
Resolution
Attack activity ceased by the attacker
Persistent API polling caused prolonged server slowdown
Affected Scope
All players
Duration
From July 2025 to September 2025, approximately two months
Root Cause
Someone continuously polled the domestic server API, causing sustained resource exhaustion and server slowdown. Different in nature from the invoice spam attack — this was attrition-style interference
Resolution
Superseded by the Sep 2025 account scanning incident. Exact end date unknown
Japan-side IP blacklist logic failure caused nationwide grey-network outage
Affected Scope
All players
Duration
Several hours, restored the same day
Root Cause
Japan-side IP blacklist logic malfunctioned, placing all IP requests in a blocked state. Cabinets failed repeated pings and went grey-network
Resolution
Domestic service restored after blacklist logic fix
Server attacked again, new song sync affected
Affected Scope
All players
Duration
2024-09-03 to 2024-09-07, approximately 4 days
Root Cause
Same attacker launched another round of attacks affecting new song data sync
Resolution
New song sync restored on 2024-09-07
wcaime server attacked, WeChat QR code login unavailable
Affected Scope
Players relying on WeChat QR code login
Duration
Several hours
Root Cause
Attacker targeted the wcaime node used by WeChat. Wahlap had redundancy but the attacked node happened to be the one WeChat resolved to
Resolution
Naturally recovered. Players could try using the last cached QR code
Domestic service temporarily closed
Affected Scope
All players
Duration
Several hours
Root Cause
No official reason disclosed, suspected to be related to the previous day's server change
Resolution
Restored the same day
Login failure nationwide, error code 103
Affected Scope
All players
Duration
00:12 to 10:00 on 2024-07-09, approximately 10 hours
Root Cause
Suspected SEGA backend server change caused login requests to return error code 103
Resolution
Login restored at 10:00, cabinets back online