When this issue occurs, the DSM may be in a problem state and will require repair.
Follow these steps:
- Re-download the DSM from the Deep Security Help Center.
- Run the installer and choose Repair the existing installation.
Please make sure there are no windows open for DSM installation folder such as c:\program file\Trend Micro\Deep Security Manager\ to prevent repair failure. - Once the repair is finished, re-activate agent.