Plesk Premium Antivirus cannot update nor during a scheduled update, nor manually with the following error:
ERROR: Dr.Web Updater: failed to download files !
Both firewall and DNS settings as per the following KB are valid;
Maintenance on the update servers.
Connect to the server via SSH;
Download the attached list of working update servers and put it in the
# wget https://support.plesk.com/hc/en-us/article_attachments/360019451453/custom.drl
# wget https://support.plesk.com/hc/en-us/article_attachments/360018745774/signature.asc
# cp custom.drl /var/drweb/bases/
# cp signature.asc /var/drweb/bases/
Run the update: