Reparar plugins
https://community.tenable.com/s/article/Nessus-feed-reset-to-fix-plugin-issues-or-error
https://docs.tenable.com/nessus/commandlinereference/Content/UpdateThePluginsOnly.htm
Windows
Open an elevated command prompt on the Nessus Scanner.
Stop Nessus.
net stop "Tenable Nessus"
Reset Nessus.
C:\Program Files\Tenable\Nessus\nessuscli fix --reset
Re-register Nessus.
C:\Program Files\Tenable\Nessus\nessuscli fetch --register <ACTIVATION_CODE>
If this fails:
Set the Proxy settings (OPTIONAL):
C:\Program Files\Tenable\Nessus\nessuscli fix --secure --set proxy=<IP or Hostname of Proxy>
C:\Program Files\Tenable\Nessus\nessuscli fix --secure --set proxy_port=<Port of Proxy>
C:\Program Files\Tenable\Nessus\nessuscli fix --secure --set proxy_username=<Username of Proxy>
C:\Program Files\Tenable\Nessus\nessuscli fix --secure --set proxy_password=<Password of Proxy>
Reset the Activation Code on Tenable Community.
Rebuild the plugin database.
C:\Program Files\Tenable\Nessus\nessusd -R
Start Nessus.
net start "Tenable Nessus"
These can also optionally be run after the register command, to be thorough:
To verify the registration took:
C:\Program Files\Tenable\Nessus\nessuscli fetch --check
To check for any updates:
C:\Program Files\Tenable\Nessus\nessuscli update --all