Self Protection Failed Error Code 4 X360ce 2021 Fix Jun 2026

To avoid encountering the Self Protection Failed Error Code 4 x360ce 2021 in the future:

Windows Tamper Protection preventing modification of game files. Phase 1: Immediate Fixes (Antivirus & Permissions) 1. Add Exclusions to Windows Security (or Third-Party AV)

Download the latest official release of the directly from the official Nefarius Software Solutions GitHub repository.

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Observed Behavior

The application may fail if it cannot verify its state due to a firewall blocking its outbound connection. Step-by-Step Fixes for Error Code 4 1. Configure Windows Firewall (The Most Effective Fix)

Click the Windows Start menu, type , and open it. To avoid encountering the Self Protection Failed Error

Open the x360ce app (ignore the error for a moment if it lets you access the UI). Go to the or Issues tab.

Choose , click Next , and browse to the x360ce.exe file or the game executable causing the issue.

Move your x360ce application files or game installation files into this directory. This public link is valid for 7 days

Scroll down to and click Add or remove exclusions . Click Add an exclusion and choose Folder .

The most common cause is Windows Defender flagging the x360ce files. Open > Virus & threat protection .