Error Code 4 X360ce 2021 |work| | Self Protection Failed

The error "Self protection failed error code 4" in x360ce (2021 version) usually occurs when the program tries to apply DLL overwrites or hook into a game’s input system, but Windows security features or file permissions block it.

The excitement vanishes. For Alex—and many others in 2021—this error became a common digital wall. Here is the story of how that error happens and how the community learned to fix it. The Mystery of the Failing Shield self protection failed error code 4 x360ce 2021

Fixing the "Self Protection Failed Error Code 4" in x360ce (2021 & Beyond)

If you are trying to use x360ce (the popular Xbox 360 controller emulator) to make your non-standard gamepad work in modern PC games, you have likely encountered a frustrating roadblock. You set everything up, run the application as Administrator, and suddenly—a red error message appears: The error "Self protection failed error code 4"

  1. Delete all current x360ce files.
  2. Download x360ce_3.2.9.1.zip from a reputable archive (e.g., GitHub or x360ce.com's legacy section).
  3. Extract and run as Administrator. Version 3 does not have Error Code 4.

Report: “Self Protection Failed — Error Code 4” in x360ce (2021)

Summary

Causes of the Self Protection Failed Error Code 4 x360ce 2021 Delete all current x360ce files

Still Getting Error 4?

| If you have… | Try this… | |--------------|-------------| | Controller working in other software | Use Input Mapper or DS4Windows instead | | Only need basic mapping | Use Steam Input or JoyToKey | | Windows 11 with latest update | Roll back Windows update or use ViGEm Bus Driver manually |

  1. Confirm x86/x64 match.
  2. Run as Admin.
  3. Disable AV temporarily and retry.
  4. Close other input utilities.
  5. Check game anti-cheat — avoid using x360ce with active anti-cheat.
  6. If unresolved, use a hardware controller or configured Steam Input.
  1. Windows Security Enhancements: In 2021, Microsoft strengthened Controlled Folder Access (part of Windows Defender). This ransomware protection blocks untrusted programs from writing to critical folders (like Documents, Downloads, or game installation folders).
  2. Driver Signature Enforcement: Windows 10/11 updates increased kernel-level security, making it harder for x360ce’s virtual driver (ViGEm Bus Driver) to install cleanly.
  3. Corrupted User Profiles: Many legacy x360ce users had old .ini or .dll files from versions prior to 2020. These legacy files conflict with the new "self protection" logic.