It is showing that it originated from one server to another server on the same local network. We are already behind VPN and firewall, so I'll need to investigate further. You can also read more about hardening your RDP security in our article below, such as moving RDP behind a VPN, using a 3rd party remote access service, etc. Once you are confident Windows Firewall is working properly, you can enable Block Mode and Malwarebytes will create temporary Windows Firewall rules to block the IPs that are attempting to Brute Force for the time you specified within the policy. Before enabling Block Mode, I would suggest first enabling Windows Firewall on your devices to ensure it's compatible with your current configuration and add any Allow rules as needed to the Windows Firewall. Switching to Block Mode will enable the Windows Firewall and block the offending IP for the time you set within the policy. Monitor mode will give you a general idea of the number of failed login attempts you are seeing, and help you identify if your RDP is under a attack from a Brute Force attempt. You can learn more about Brute Force Protection here: With Brute Force Protection enabled, the default setting is "monitor mode" which will trigger a Remote Intrusion Detection when your Windows Remote Desktop (RDP) sees 5 failed attempts within 5 minutes from the same IP address. This alert is created by the Brute Force Protection setting within your Nebula policy. Thank you for reaching out to us for more information regarding the RDP Intrusion Detections. Endpoint Detection & Response for Servers
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