An Error Has Been Signaled By The Protected Object Server File Synsoacc.dll Free Jun 2026

Temporarily uninstall any non-Microsoft antivirus or EDR software. Reboot into Safe Mode with Networking . If the error disappears in Safe Mode, the culprit is a third-party filter driver or security hook. Reinstall the security software but add an exclusion for C:\Windows\System32\synsoacc.dll and lsass.exe .

The "an error has been signaled by the protected object server file synsoacc.dll" error can manifest in various ways, including: Reinstall the security software but add an exclusion

If the file exists but isn't working, the built-in maintenance tool can often reset the link. Cubase 7.10 won't load, SYNSOACC.DLL not found When they incorrectly flag synsoacc

DISM /Online /Cleanup-Image /RestoreHealth Reinstall the security software but add an exclusion

Some aggressive security suites attempt to hook into the LSA process to monitor authentication events. When they incorrectly flag synsoacc.dll as suspicious or attempt to sandbox it, Windows’ Protected Process Light (PPL) mechanism detects the interference and shuts down the object server, triggering the error.

synsoacc.dll typically resides in C:\Program Files\Windows Live\Sync\ or C:\Windows\System32\ . If the file’s permissions are altered (e.g., after a malware cleanup or manual changes), the protected object server refuses to load it.