Classification code Issue Solution
Not installed
[How to install manual installation copy]
  1. (1) Click Download Manual Installation KOS_Setup.exe
  2. (2) Open downloaded KOS_Setup.exe
  3. (3) When the "Do you want to allow this app to change devices?" pop-up appears, click [Yes]
  4. (4) Click Install when the "Start Installing Kings Online Security" screen appears
  5. (5) When the "Please press the End Everyone button to proceed" screen appears, click [End All]
  6. (6) Click Finish on the 'Kings Online Security Installation Completed' screen
  7. (7) Refresh the Internet (F5)
Not installed
[Checking for and Resolving Non-Installation Issues]
  1. 1. 1544-1014 Wired Inquiries
  2. 2. Manual workaround
  3. (1) Task Manager > Details or Details Tab > Check Process
  4. (KOSSvc.exe, KOSinj.exe, KOSinj64.exe)
  5. (2-1) [If there is no KOSSvc.exe]
  6. 작업관리자 > Task Manager > Services > KOS_Service Stopped > Right-click > Start
  7. (2-2) [If KOSinj.exe / KOSinj64.exe is suspended]
  9. C Drive > Program Files (x86) > Kings Online Security > KOSinj > Right-click > Run with Administrator privileges
  10. (2-3) [If there is no KOSinj64.exe]
  11. Delete the 'Turbo Cleaner' antivirus program and restart the computer.
  12. (3) [If it stops during installation]
  13. Restart your computer after deleting the 'Rav Endpoint Protection' antivirus program
More than input
[Unable to enter text in the password field]
  1. 1. 1544-1014 Wired Inquiries
  2. 2. Manual workaround
  3. (1) Delete programs that affect keyboard input (for example, KVM)
  4. (2) Hancom inputter IME conversion: right-click '가' in the far right corner of the task line
  5. - click Microsoft inputter
  6. (3) N key rollover when using mechanical keyboard "N key rollover function turned off"
More than input
[No input, Enter representative value,
Enter other values]
(1) Direct input using keyboard
(2) Windows on-screen keyboard input
(3) Input using copy and paste
(4) Keyboard input occurs automatically without pressing any keys
  1. Install Korean language pack and reboot Windows
  2. (1) Go to [Settings] on Windows.
  3. (1-1) Go to [Time & Language] – [Language & Region]
  4. (2) Click [Add a language] on the [Preferred languages]
  5. (3) Type and search [Korean], then click [Install]
  6. (4) After the installation finished, Reboot your PC.
  7. If the problem happens repeatly, Please contact us to via e-mail.
  8. How to Set Up Windows Language Packs
Error Code
[Error Protection Failed, KOS5003]
Using an Unsupported Browser
  1. Edge, Chrome Browser Recommended
Error Code
[KDF0011]
(1) Conflict with other vaccine security programs (360 security)
(2) Not enough hard disk space
(3) DigiCert certificate signature corruption
(4) The PC account you are using does not have administrator
  • privileges
    		•
    1. ⑴ Restart your computer after deleting other vaccine security programs (such as 360 security)
    2. (2) Secure capacity through PC organization or formatting
    3. (3) View workarounds in case of DigiCert certificate signature corruption
    4. (4) Right-click Internet Browser > Run as Administrator
    Error Code
    [KDF0002]
    Important files (kdfhok.dll) are deleted
    1. (1-1) Copy windows + R > Open system32 > Folder to Run Search > kdfhok.dll
    2. (1-2) Windows + R > Open syswow64 > Folder in Run Search > Paste kdfhok.dll
    3. (2) HTS shutdown and restart
    Error Code
    [KDF0004]
    Conflict with other vaccine security programs (360 Security)
    1. - Control Panel > Delete Security Program (360 Security)
    Error Code
    [KDF0005]
    In 'Do you want to allow this app to change devices?' Click Reject
    1. - Reboot > Click Yes when the 'Allow this app to change devices' pop-up appears
    Error Code
    [KDF0003, KDF0010]
    (1) Lack of PC performance (CPU, memory, etc.)
    (2) When multiple processes have been created
    (when using the insurance company's site)
    1. (1) Rebooting and PC check and upgrade recommended
    2. (2) Manual installation of keyboard security: After installing the manual installation file
    3. [KOS_Setup.exe] (restart computer)
    Error Code
    [KDF0009, KDF1001, KDF2001, KDF2002]
    Keyboard security program damage
    1. Manual installation of keyboard security: After installing the manual installation file
    2. [KOS_Setup.exe] (restart computer)
    Error Code
    [KOS2002]
    Broken Korean characters due to PC region setting error
    1. - win10 : Control Panel > Clock and Country > Country or Region > Administrator Options >
    2. Change System Locals
    3. > Set the current system locale to 'Korea'
    4. - win11 : Settings > Time and Language > Language and Region > Default Language Settings >
    5. Administrator Options
    6. > Change system locale > Set current system locale to 'Korea'
    Error Code
    [KOS4004]
    1. (1) Keyboard Security Manual Installation: After installing manual installation [KOS_Setup.exe] (Reboot computer)
    2. (2) Handling exceptions if you block from security programs on your company or personal PC
    3. (3) 1544-1014 Wired Inquiries
    Error Code
    [KOS1001]
    1. - 1544-1014 Wired Inquiries

    Error details Solution
    [SmartScreen Filter Screen]
    Microsoft (MS) announced that it will strengthen its SmartScreen Filter starting in August 2024.
    [Microsoft Notice]
    https://learn.microsoft.com/ko-kr/security/trusted-root/program-requirements
    ▶ "Starting from August 2024, all EV code signing OIDs will be removed from the
    existing roots of the Microsoft Trusted Root Program, and all code signing
    certificates will be treated the same way."
    * Is there a way to disable the Smart Screen Filter warning?
    You can disable the Smart Screen Filter feature through individual settings on the user's PC.
    Alternatively, it will be disabled once Microsoft establishes a reputation.
    1. 1. The user must check the executable file and select [Run].
    3. Or
    4. 2. Individual PC Settings (Disabling SmartScreen)
    5. ⑴ [ Windows ] Settings > Privacy & Security > Windows Security > Open
    6. Windows Security > App & browser control > Reputation-based protection settings > Scan apps and files / SmartScreen for Microsoft Edge / Turn off SmartScreen for Microsoft Store apps
    7. ⑵ [ Edge ] Tools > Settings > Privacy, search, and services > Security >
    8. Turn off Microsoft Defender SmartScreen
    9. ※ Disabling the Smart Screen feature on your PC may expose you to malware.
    10. ※ Companies and organizations should consult with their organization's person in
    11. charge. (PC, IT, information security)
    12. See how to set up your PC individually
    [ErrorCode : KOS-5002]
    ⑴ If an error occurs: ERROR_PROTECTION_FAILED
    1. ⑴ Keyboard security manual installation : After installing the manual installation file
    2. [KOS_Setup.exe] 설치 후 (reboot)
    3. ⑵ Edge, Chrome, FireFox browsers are recommended
    4. ⑶ Use Edge or Chrome browser instead of "Avast Secure Browser"
    6. ⑷ Clear internet cache and connect
    Windows security update recommended
    ※ We recommend using Windows 10 or higher operating system (OS).
    ▶ At least Windows 7 SP2 (Service Pack 2) or higher

    ※ OS you are using : [ ]

    1. How to update Windows security
    2. ⑴ Windows 10, Windows 11
    3.     : Settings -> Update & Security -> Check for updates
    4. ⑵ Windows 8.1
    5.     : Control Panel -> Windows Update -> Check for Updates
    6. ※ The first update takes time and requires two or more reboots.

    ※ If you are a Windows 7 user

      - On January 14, 2020, Microsoft ended support for Windows 7.

      - If it is difficult to replace or upgrade right away, we recommend updating to at least Windows 7 Service Pack 2 or higher.

    If you are a Windows 7 user, be sure to check it out.

    ※ If you are a Windows XP user

      - We recommend installing the latest OS or upgrading your computer.   /   " What is "Windows XP"? / "Windows XP" update MS site

    ※ Support for Windows 8

      - In MS, it ended on January 12, 2016, and support for Windows 8.1 will end on January 10, 2023.   /   View MS Official Guide
    When a problem or symptom occurs while using the website
    We recommend that you try using two or more web browsers.
    1. ⑴ If it doesn't work in Chrome, try again in IE.
    2. ⑵ If it does not work in IE, try again in other web browsers such as Chrome.
    4. Download Google Chrome

    ※ As of June 15, 2022, Microsoft (MS) has ended official support for the IE 11 web browser.

    - When technical support ends, IE 11 may become vulnerable to security threats such as hacking.

    - IE users are recommended to use the latest web browsers such as Edge and Chrome.

    - View MS announcements following the end of IE 11 support
    If you cannot enter the joint certificate password in 'Sign Korea'
    ⑴ Cases that occur when renewing, reissuing, or managing joint certificates
    ⑵ If the same symptom occurs on other sites
    1. ⑴ Your PC is
    2. ⑵ You need to check whether the bit of the browser you are using is the same as
    3. that of your PC.
    4. ⑶ If the bit of your PC and browser are different, reinstall the browser
    5. (close the browser and relaunch it) and reconnect to the site.
    6. Check your browser bit
    [ErrorCode : KDF2001]
    Keyboard security program not installed (kdfinj.dll integrity)
    1. ⑴ Click 'Execute' in the security warning message when running HTS
    2. ⑵ Keyboard security manual installation: After installing the manual installation file
    3. [KOS_Setup.exe] (reboot)
    [ErrorCode : KDF0002]
    Keyboard security does not work normally
    1. Close and restart HTS
    2. In the case of an old PC, execution is not possible due to excessive CPU and memory usage.
    3. ⑴ Simultaneously touch Ctrl + Shift + Esc to run Task Manager
    4. ⑵ Check the usage rate of the performance tab when running HTS (requires PC
      inspection or replacement      )
    5. ⑶ The kdfhok.dll file inside C:\Windows\System32 copy to kdfhok.dll
    [ErrorCode : KDF0003, KDF20001]
    In the case of using "McAfee Internal Security"
    1. Applied during initial installation
    2. ⑴ Right-click on the Internet browser and click "Run as Administrator"
    3. ⑵ Right-click the program and click "Run as Administrator"
    [ErrorCode : KDF0003 Keyboard security program error]
    ⑴ Keyboard security is repeatedly blocked and terminated (malicious code or utility)
    ⑵ Conflict with other security tools
    ⑶ If the CPU load of the PC is high
    1. ⑴ Keyboard security manual installation: After installing the manual installation file
    2. [KOS_Setup.exe] (reboot)
    3. ⑵ CPU utilization check
    4. ⑶ Antivirus checks whether the keyboard security blocking module is blocked,
    5. and if it is blocked, an exception is processed.
    6. (Overseas vaccines such as Daum Cleaner, Process Clean, and Kaspersky)
    7. ⑷ In case of recurring problems, remote support is required
    [Installation Error :
    Installation failed after about 80% of the installation program progressed]
    After running the Keyboard Security Installer, 'Installation was cancelled.' If it says
    1. ⑴ Add and Modify Folder Permissions
    2. See how to set folder permissions
    3. ⑵ Manual installation after termination of overseas security program
    [If ababab or 121212 or ****** values ​​are output when input]
    ⑴ In the case of Hangul and Computer Hancom Office User PC
    ⑵ When using a mechanical keyboard
    1. ⑴ Restore MS default IME input method
    2. See how to change the Hancom input method
    3. ⑵ Disable N key (infinite simultaneous input) or macro of mechanical keyboard
    4. ⑶ If you are using a DeckKeyboard, refer to the manual in the data room of the
    5. DeckKeyboard homepage.
    6. View DeckKeyboard homepage manual
    7. ⑷ In case of recurring problems, remote support is required
    [Security module conflict]
    AVAST Anti-Virus : "Kings.nefficient.co.kr" or If "kdfinj.dll" is blocked
    1. ⑴ Website (kings.nefficient.co.kr) inspection exception handling
    2. : Run Avast - Real-time processing - Web monitoring - Advanced settings - URL registration in Exceptions
    3. ⑵ Security module (kdfinj.dll) inspection exception processing
    4. : Run Avast - Preferences - Exceptions - Program Folder Registration
    [Korean/English conversion disorder]
    Korean/English conversion is not possible in i-PIN or identity verification
    1. ⑴ Start menu -> After entering CTFMON in the program and file search box,
    2. run ctfmon.exe at the top
    [Blue Screen]
    After creating a blue screen dump, send it to the administrator by mail
    (관리자에게 메일)
    See how to create a bluescreen dump
    1. ⑴ In case of occurrence in HTS : In case of Windows 7, Vista, HTS property
    2. - Check compatibility check release
    3. ⑵ Keyboard security manual installation: After installing the manual installation file
    4. [KOS_Setup.exe] (reboot)
    [Blue screen, PC down: OS after January 2018]
    Compatibility with MS patch related to Intel CPU meltdown
    ⑴ OS: Windows 7 (32bit) or Windows 8 (32bit)
    Keyboard Type : In case of PS/2 type keyboard
    (After MS OS update KB4088875 patch: 2018.03.14)
    ⑵ OS : Windows 7 (64bit) or Windows 8, 8.1 (64bit)
    Keyboard Type : In case of PS/2 type keyboard
    (After MS OS update KB4056897 patch: 2018.01.03)
    1. Proceed with the following procedure
    2. ⑴ Reboot progress
    3. ⑵ Click the manual installation file [KOS_Setup.exe] to download
    4. ⑶ Run the downloaded file
    5. ⑷ 정Check normal operation
    6. ※ If you still have problems after completing the procedure, contact the consultation window or technical support center
    7. : 1544-1014, mail to administrator
    [KDF-DAC], [KDF-DUC], [DETECT_USBPORT_CHANGED]
    ⑴ If there is something monitoring the USB port (malware or utility)
    ⑵ Conflict with other security tools
    1. ⑴ Install with the manual installation file [KOS_Setup.exe] and use the service
    2. after rebooting
    3. ⑵ Recurring problem requires remote support
    [PC Maintenance Information]
    ※ It is recommended to check PCs that have passed more than 2~3 years
    after OS installation.
    ○ It is recommended to use a specialized company (expert)
    (→ Refer to [PC inspection company information] on the right)
    ○ OS upgrade, reinstall or update
    ○ Replace hard disk with SSD (helps improve performance)
      (Reference: SSD types and characteristics /
    How to find out the lifespan of my computer's SSD)
    ○ Hard disk data recovery
    ○ Hard disk life
    1. [Information on PC maintenance companies]
    2. ▷ Naver PC maintenance search
    3. ▷ Samsung Electronics service
    4. ▷ LG Electronics service
    1. [Portal site search: PC/Laptop]
    2. ▷ PC purchase reference
    3. ▷ Notes on purchasing a laptop
    ※Please note that the contents of the [PC Check/Purchase Guide] are simple recommendations and references, so the choice should be made according to the user's circumstances, and the decision is also at the user's responsibility.