• Windows Update must be enabled in order to receive Defender anti-virus signature and other updates on a regular basis.
  • Run Windows Update manually to ensure that Windows Defender is updated to at least version 1.355.x.y, and to the latest version if newer than that. If you have just installed Defender as a Windows feature for the first time, it is possible that the default base installation is too old for LISTSERV to recognize.
  • Check that LISTSERV sees Windows Defender and is reporting the current Virus database version by sending LISTSERV a RELEASE command.  This should result in something like the following:

LISTSERV(R) High Performance for Windows version 17.5, managed by:
  servermanager@yourdomain.com


Master nodes file version: 2001-02-07 07:30:26 (VERS9922)
NJE peers file version: 2020-02-17 23:34:36
Internet peers file version: 2023-12-08 17:02:54
Service file version: 2009-10-07 16:45:40 (VERS9922)
Alias file version: 2013-09-09 09:03:20
Virus database version: 2024-11-20 18:58:06 (1.421.251.0)
Running under: Windows Server 2022 Standard x64 Edition
Build date: 20 Nov 2024

The virus database version number shown in parentheses should match the anti-virus definition and anti-spyware definition versions shown at the bottom of the Settings/Update & Security/Windows Defender page.