Source / rights
Knight Online errors: symptom, cause and fix
| Error / symptom | Likely cause | What to do |
|---|---|---|
| Game won't start, a message on the login screen, or constant DCs | Maintenance, full server, connection or region block; the message tells you which | What each message means is in the not starting / DC guide |
| Downloaded it but it won't open or patch | Servers are down for maintenance (no updates during maintenance), the launcher can't finish updating, or the client is outdated | If it is maintenance, wait it out; otherwise see the launcher section of the download and install guide |
| "Extract failed" while patching or installing | Patching while the game is running; a file in the patch (e.g. KnightOnline.exe) is in use and can't be overwritten | Close every game window and run the launcher again |
| "There is no active OTP/ICS on your account" | ICS not set up, or not activated for Knight Online on the portal | OTP setup guide: setup and portal activation |
| "Access Restricted" (server open to ICS-registered users only) | No ICS registration on the account | The steps in the OTP setup guide |
| OTP is not active, OTP code rejected | OTP or time sync problem | OTP error guide |
| AnyOTP is blocked | Wrong AnyOTP password entries | Open a support ticket |
| ICS won't accept your phone number | The number is already on 3 accounts (May 13, 2026 rule) | Continue with a number never used for ICS |
| No OTP ID or auth code | The setup text was deleted or lost | otp.nttgame.com > My ICS > Resend OTP ID & Auth Code |
| New phone, OTP not arriving | ICS still has the old number | My ICS > Change Mobile (5 NPoints, once per 24 hours); ticket if the old number is gone |
| Can't trade | No SMS verification on the account | Portal > My Account > Game Services > SMS Verification (code valid 600 seconds) |
| Can't join or register on a new server | OTP inactive, phone not verified, server changes used up, or registration paused | New server guide and OTP setup guide |
| "Duplicate IP is detected" | More than one character from the same IP trying to enter an event | Event messages in the not starting / DC guide |
| Bought NPoints but they didn't arrive | Payment verification can take a few days | Don't pay again or open a chargeback; ticket if it drags on |
| Bought the wrong item, want a refund | Store purchases aren't refunded | No refunds; double-check before buying |
| Forgot my password or ID | Lost login details | Use "Forgot your password?" or "Forgot your ID?" on the sign-in page |
| Password, ID or VIP Key email never arrives | Delivery problem to Hotmail, Outlook and Live addresses (NTTGame, February 24, 2026) | NTTGame is looking into it; open a ticket if the step can't be finished |
| Disconnects while playing from abroad | NTTGame reported DDoS attacks from abroad in March 2025 | Follow the notices; for codes like 10060/10053 see the connection errors guide, then open a ticket if it continues |
| Forgot the security key or VIP vault key | Key lost | Portal > My Account > Game Services > Knight Online: a reset link goes to your email |
| Account stolen | Password or email compromised | Change your email and password right away and open a ticket |
| Got banned | Rule violation detected | Banned account guide (the official appeal route) |
Common Knight Online errors with their symptom, cause and NTTGame-sourced fix on one page: won't start/DC, patching, extract failed, OTP and ICS, new servers, trade SMS verification, NPoints and account problems.
Detailed guides by error code
If the screen shows an error code or a specific message, jump to that error's own guide below; SteamKO errors are listed here too.
Source / rights
- 10060, 10061, 10053, "Login Server Connection Failed" and "Disconnected from server"
- XIGNCODE errors: 0xE019100B, bar not filling, AppSign, hooking API, virtual machine
- Runtime Error, missing DLL and "Sound Device Fail"
- "Invalid Data Tables" and "Archive open failed"
- "undefined" error when creating an account
- Bug Report window and game crashes
- Every login, connection and security message in the game (105 messages)
- In-game warning messages and what they mean (214 warnings)
- Steam Knight Online (SteamKO) not starting
- SteamKO error 18: "New connection detected"
- SteamKO phone authentication errors
- SteamKO error codes: 0, -8, -95, -99 and 255
- SteamKO account blocks: 2099 ban and Account Creation Abuse
- Error 10053: connection aborted, kicked from the game
- Extract failed: the patch stops halfway
- Patch not downloading, the launcher won't update
- Forgot password and security key reset
- VIP storage key reset
Knight Online won't start
The login screen message tells you why: maintenance, a full server, the connection or an ICS region restriction. What each message means and what to do is in the not starting / DC guide, along with the fix for the game not opening after the DirectX 11 update.
Knight Online patch not downloading or extract failed
If the patch won't download, check for maintenance first: the launcher can't get updates during maintenance. If the patch stops with "extract failed", the game or another client is still open. Step-by-step fixes: Patch not downloading, the launcher won't update and Extract failed: the patch stops halfway.
Source / rights
"There is no active OTP/ICS on your account"
This means ICS isn't set up or isn't switched on for Knight Online. Finish setup at otp.nttgame.com, then activate ICS for Knight Online on the NTTGame portal under My Account > Overview > Game Services. The full steps are in the OTP setup guide.
Knight Online trading won't unlock
Trading needs SMS approval or premium on the account. Since October 2026 you first add a number on the portal under Overview > Cell Phone; then under Game Services > SMS Approval the code is texted to that number and the step costs 5 NPoint. The steps are in How to enable trade: SMS approval, and error -101 with deducted NPoint in Phone verification problems and fixes.
Can't join a new Knight Online server
The new servers open on November 12, 2026 at 16:00 Turkey time, and only pre-registered accounts can join. Pre-registration needs a verified phone number and OTP+ on the account; the second pre-registration is open until November 12. The steps are in Knight Online new server pre-registration, and OTP warnings in Knight Online OTP error.
Server Entry Requirements are not met error fix
Source / rights
Forgot your password, security key or VIP vault key
The account password and security key reset on the NTTGame portal; the VIP vault key is a separate lock. Hotmail and Outlook addresses may not get the reset e-mail. Steps: Forgot password and security key reset and VIP storage key reset.
NPoints didn't arrive, or you bought the wrong item
NPoints can take a few days to arrive because of payment verification; don't pay again or open a chargeback in the meantime. PUS and web shop purchases aren't refundable; details are in the Power Up Store guide.
Official support: where do you open a ticket?
NTTGame support lives at support.nttgame.com. To open a ticket you log in with your portal account (Login With Portal ID); without logging in you can still read the Knowledgebase articles on ICS, SMS, NPoints and accounts. NTTGame says it treats logins through proxy IPs as suspicious, so try your normal connection first if you have connection trouble.
Playing from abroad? In March 2025 NTTGame reported heavy DDoS attacks from abroad on its game and web servers and said they were causing connection problems mainly for players outside the country. Region blocks and VPNs are covered in the not starting / DC guide.
Source · support.nttgame.comNTTGame — Submit a support ticket
Source · support.nttgame.comNTTGame — Knowledgebase
Share your experience