Top 10 RDP Security Best Practices to Prevent Hacks

1. Change the Default Listening Port

By default, RDP listens on port **3389**. Automated hacker scans and botnets scan the internet constantly for open 3389 ports to execute brute force password dictionaries. Modifying this listening port in the Windows Registry to a custom high-range port immediately filters out 99% of automated scans.

2. Configure Strict IP Whitelisting

Allowing RDP connections from any public IP is highly dangerous. Deploy the Windows Defender Firewall to configure strict inbound connection rules. Only permit connections originating from your home, office, or VPN static IP addresses, locking out all foreign network packets.

"IP whitelisting is the single most effective firewall strategy to completely eliminate brute force attacks on your virtual servers."

3. Implement Complex Passwords & Lockouts

Ensure all RDP accounts use complex passwords containing a mix of symbols, letters, and numbers. Additionally, configure Windows Account Lockout Policies to temporarily lock out any IP address that fails login attempts 5 consecutive times, preventing dictionary-based cracking.

4. Enforce Network Level Authentication (NLA)

Enable Network Level Authentication (NLA) on your remote servers. NLA forces RDP clients to authenticate with the network before a full visual session is established, saving valuable server memory and protecting against Denial of Service (DoS) attacks on the RDP service.

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