The issue occurs because the OSCE server has enabled signature checking but the checked file cannot pass.

To resolve the issue, disable the signature checking:

1. Open the aucfg.ini file located under PCCSRV\Web\Service.
2. Set the value of the following key to "0".

   check_files_signature=0

3. Restart the OfficeScan Master Service.

If the issue persists, collect the logs:

1. Enable the debug log in aucfg.ini using the commands below:

   [debug]
   level=-1

2. Use the Case Diagnostic Tool (CDT) to activate the debug mode.
3. Replicate the issue.
4. Gather the following files and send to Trend Micro Technical Support:
   • CDT logs with all the events including the tmudump.txt1 file
   • timestamp.txt