Trend Micro Deep Security Anti-malware Driver Offline Not Installed Guide

| Cause | Description | |-------|-------------| | Incomplete installation | The anti-malware feature was selected, but the driver failed to install during setup. | | Driver blocked by security software | Another antivirus or EDR solution is running and prevents Trend Micro's driver from loading. | | Windows Driver Signature Enforcement | The driver might be unsigned or blocked by Secure Boot / Driver Signature Enforcement. | | Corrupted driver files | The driver files (tmcomm.sys, tmactmon.sys, tmevtmgr.sys, etc.) are missing or damaged. | | Deep Security Agent offline | The agent reports the driver as offline because the service is not running. | | After OS upgrade | Windows feature updates can unload or block incompatible drivers. |

Secure Boot prevents unsigned drivers from loading.

If you have completed all steps and still see the error, collect the following diagnostic information: | Cause | Description | |-------|-------------| | Incomplete

Trend Micro support will often request a driver verifier dump (Windows) or a kdump (Linux) to check for kernel conflicts.

After a Microsoft Patch Tuesday, a Windows kernel update may change the filter manager structure. If the Trend Micro driver (tmebc.sys, tmcomm.sys) was compiled for an older kernel version, it will fail to load. The agent shows as "online," but the anti-malware driver remains offline. If you have completed all steps and still

For the agent to build the driver locally, specific packages must be installed.

For air-gapped systems:

Once you resolve the “Anti-Malware Driver Offline Not Installed” error, implement these best practices:

Open regedit and navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tmcomm Trend Micro support will often request a driver

Ensure the Start DWORD value is 0 (Boot start). If it is 3 (Manual) or 4 (Disabled), change to 0 and reboot.