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

The error typically occurs when the Deep Security Agent (DSA) experiences a corrupted installation, lacks essential operating system certificates, or faces conflicts with other security software. This status is often visible in the Deep Security Manager (DSM) console or through the Deep Security Notifier on the local machine. Common Causes for the Error

Ensure your Deep Security Relays are regularly updated so agents can easily fetch local component updates and security rules.

Check agent and module status

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

If you recently enabled Secure Boot, it might block the driver if the specific version lacks the required Microsoft co-signature. Try temporarily disabling Secure Boot in your environment's BIOS/UEFI settings to test if the driver loads. Step 3: Trigger a Manual Driver Reinstallation The error typically occurs when the Deep Security

If you run other security monitoring tools (like EDR or forensic tools), configure mutual exclusions. This prevents multiple security drivers from locking the same system file-system hooks.

Linux agents compile or load specific kernel modules ( ds_am ). If the Linux kernel was updated via yum update or apt-get upgrade , the existing Deep Security driver may fail to compile against the new kernel headers. Check your current kernel version: uname -r Use code with caution.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager

Troubleshooting Trend Micro Deep Security: Anti-Malware Driver Offline or Not Installed Check agent and module status Once you resolve

If no modules are listed, check if the module compilation failed due to an unsupported kernel version: uname -r Use code with caution.

Conflicting drivers from other security software or corrupted system files.

A previous installation of Deep Security Agent may have left behind residual drivers ( tmactmon.sys , tmcomm.sys , tmevtmgr.sys ) that block a clean reinstallation. Remnants from other Trend Micro products (e.g., OfficeScan/Apex One, Client/Server Security Agent) also prevent DSA's tmtdi driver from being installed.

If blocked, enroll the Trend Micro MOK key using the mokutil utility provided in the Deep Security installation directory, reboot the system, and accept the key at the blue shim boot screen. The Ultimate Fix: Clean Reinstallation This prevents multiple security drivers from locking the

Open a command prompt or terminal with administrative privileges and run the status check command.

Note: Avoid using Windows "Fast Startup" shutdowns, as they do not fully reload the kernel. Use shutdown /r /t 0 from the command line to force a clean restart.

Troubleshooting Trend Micro Deep Security: "Anti-Malware Driver Offline Not Installed"

Always coordinate Agent upgrades with system maintenance windows to allow for reboots.