Remote Desktop Protocol lets your team reach a Windows machine from anywhere, which is exactly why attackers love it. When an RDP port sits open to the internet, automated bots find it within hours and start guessing passwords around the clock. The good news is that you can shut down almost every one of those attacks with a handful of controls applied in the right order. This guide walks through how to secure Remote Desktop Protocol from attackers using defenses your IT team can put in place this week, showing exactly how to secure Remote Desktop Protocol without removing the tools you already rely on.
Five things to fix first
- The first step in how to secure Remote Desktop Protocol is to remove it from the public internet by placing it behind a VPN or an RDP gateway.
- Turn on multi-factor authentication so a stolen password alone gets no one in.
- Enforce Network Level Authentication and account lockout to blunt brute-force attempts.
- Restrict which IP addresses can even reach the RDP port with firewall rules.
- Patch RDP hosts and clients on a schedule, and watch the login logs for spikes.
Each of these is worth doing on its own. Stacked together, they turn a soft target into one that most attackers skip for an easier victim.
Why RDP is such a common target
Attackers go after RDP because it hands them a full desktop session on a real machine. One valid login can mean access to files, credentials, and a launch point for ransomware across the whole network.
The scale of the problem comes down to exposure. A machine with RDP open on its default port announces itself to anyone scanning the internet, and scanners run nonstop. Once a target is found, brute-force tools cycle through common passwords and leaked credential lists day and night. Credential-stuffing works because people reuse passwords, so a login stolen from an unrelated breach can quietly unlock your remote desktop.
The default port problem
Leaving RDP on its well-known default port is like leaving your street address on a list every burglar checks. Changing the port number raises the bar slightly, but treat that as a minor speed bump, not a real defense. Determined attackers scan every port, so port changes buy time rather than safety.
What a successful RDP breach costs
Once someone is inside over RDP, they often move sideways to other machines, disable backups, and stage a ransomware payload before you notice. For a small or midsized business, that can mean days of downtime, regulatory reporting duties, and a recovery bill far larger than the cost of locking RDP down in the first place. Attackers rarely act the moment they get in. Many sit quietly for days, watching how your team works, learning which servers hold the data worth encrypting, and locating the backup systems they need to destroy first. By the time the ransom note appears, they have usually already removed your ability to recover cleanly.
The teams that come through these events best are the ones that treated remote access as a security boundary rather than a convenience. When RDP is fenced off properly, a stolen password becomes a dead end instead of a front door, and a single compromised laptop stays a single compromised laptop.
Cut off internet exposure first
The single most effective move is to make sure no RDP port answers directly from the open internet. Do this before you touch anything else, because it removes the path most attacks travel.
Start with a VPN. A virtual private network makes users authenticate and build an encrypted tunnel into your network before RDP is even reachable. From the public internet, the RDP service simply disappears. This same principle drives the secure remote access approaches many regulated firms now rely on.
Use an RDP gateway
Using an RDP gateway is a critical step in how to secure Remote Desktop Protocol, as it provides a hardened single point of entry for remote sessions. Instead of exposing each desktop, remote users connect through one gateway server that enforces policy, checks identity, and passes traffic to the right internal machine. You get tight control and clean logging from one place, which also makes audits far less painful.
Lock down access by IP
If you must allow RDP from specific locations, restrict it with firewall rules that only permit known, trusted source addresses such as your office range or a VPN subnet. Windows Firewall and your network firewall can both enforce this. Every address you block is one fewer place an attacker can knock from.
Harden the login itself
Even behind a VPN or gateway, the login screen needs its own defenses. Assume an attacker will eventually reach it and make that final step as hard as possible.
Enforcing multi-factor authentication is a key measure in how to secure Remote Desktop Protocol, ensuring stolen passwords alone cannot grant access. When a login requires a code from an authenticator app or a hardware key on top of the password, a stolen or guessed password on its own gets no one through. That one measure neutralizes the credential-based attacks that make up the bulk of RDP intrusions.
Strong passwords and account lockout
Require long, complex passwords of at least 16 characters mixing cases, numbers, and symbols, and prohibit reuse across accounts. Pair that with an account lockout policy in Group Policy that freezes an account after a set number of failed attempts. Lockout alone can stall an automated brute-force tool to the point where it gives up and moves on.
Keep Network Level Authentication on
Network Level Authentication forces a user to prove identity before a full RDP session is even set up. It ships enabled on current Windows versions, so the real task is confirming no one has switched it off during a troubleshooting session and never turned it back on. Leaving it on shrinks the attack surface and shields the host from a class of pre-authentication exploits, because an attacker cannot reach the vulnerable part of the service without first passing an identity check. Make this a line item in your build checklist so every new machine ships with it enabled, and audit existing hosts to catch any that drifted out of policy.
Limit privileges and keep watch
Reducing what any single account can do, then watching how accounts behave, closes the gaps that the earlier controls leave open.
Trim remote access down to only the people who genuinely need it, and keep local administrators off RDP wherever you can through Group Policy. Fewer privileged accounts on the remote path means fewer high-value targets and a smaller blast radius if one is compromised. Teams that build secure workspaces for hybrid teams tend to bake this least-privilege thinking in from day one.
Patch RDP hosts and clients on a regular cadence, and track security advisories so a newly disclosed flaw gets fixed fast rather than lingering for weeks. RDP has a history of serious vulnerabilities that attackers weaponize within days of disclosure, so a slow patch cycle is its own kind of open door. Build a standing process that flags RDP-related advisories and pushes fixes to remote-access hosts ahead of the general fleet, since those machines carry more risk than most. Finally, monitor the logs. A sudden run of failed logins, sign-ins at odd hours, or attempts from unfamiliar regions are early signals that someone is testing your door. Catching that pattern early is often the difference between a blocked attempt and a full breach. A zero-trust workspaces model, where every request is verified rather than trusted by default, makes this monitoring far more meaningful.
Frequently Asked Questions
Is it safe to expose RDP to the internet if I change the default port?
No. Changing the port slows down casual scanners but does not stop determined attackers, who scan every port. Treat a port change as a minor extra step, never as a substitute for a VPN, a gateway, or firewall restrictions.
Does multi-factor authentication really stop most RDP attacks?
It stops the largest category of them. Most RDP intrusions rely on a stolen or guessed password. When you require a second factor from an app or hardware key, that password alone is useless, so credential-based attacks fail at the door.
What is Network Level Authentication and should I leave it on?
Network Level Authentication makes a user prove identity before a full RDP session starts. It is enabled by default on current Windows versions, and you should keep it on. It shrinks the attack surface and protects the host from certain pre-authentication exploits.
How does an RDP gateway differ from a VPN?
A VPN builds an encrypted tunnel into your network before RDP is reachable at all. An RDP gateway is a single hardened server that brokers remote sessions and enforces policy in one place. Many organizations use both for layered protection.
How often should we patch and review RDP access?
Patch hosts and clients on a routine cadence and act quickly when a new advisory drops. Review who has RDP access at least quarterly, remove accounts that no longer need it, and monitor login logs continuously for unusual patterns.
Ready to lock down remote access for good
Securing RDP is not about one product. It is about layering the right controls in the right order, starting with getting the port off the open internet and ending with steady monitoring. If your team is stretched thin or unsure where the gaps are, that is where a partner helps. Mindcore works alongside your people to map your remote-access risk and put durable defenses in place. Book a free strategy call and we will show you exactly where to start.
