The Protected Object Server File Synsoacc.dll | An Error Has Been Signaled By

In the sprawling ecosystem of the Windows operating system, few error messages are as cryptic—and as frustrating—as the one referencing synsoacc.dll and a “protected object server.” For the average user, this pop-up can appear during seemingly mundane tasks: logging into a domain-joined machine, attempting to change a password, accessing a shared network resource, or even just unlocking a workstation after a coffee break. The message, often accompanied by an Event ID in the System Log, is not merely a random glitch; it is a signal that a core component of Windows Security and authentication has encountered a critical inconsistency.

w32tm /resync net time \\yourdomaincontroller /set Then verify the Kerberos ticket cache: In the sprawling ecosystem of the Windows operating

icacls C:\Windows\System32\synsoacc.dll /reset 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 . Reboot into Safe Mode with Networking

Open Regedit and navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters Ensure the Allowed Protection Levels value is not set to an invalid state. Then, download Process Monitor from Microsoft Sysinternals. Filter on Process Name containing lsass.exe and Path containing synsoacc.dll . Look for “ACCESS DENIED” results. Restore default permissions if necessary using icalcs : reboot and run SFC again.

sfc /scannow This will replace any corrupted versions of synsoacc.dll from the cached WinSxS folder. If SFC reports corruption but cannot fix it, proceed to:

DISM /Online /Cleanup-Image /RestoreHealth After DISM completes, reboot and run SFC again.