Network Level Authentication (NLA) validates user credentials before establishing RDP (Remote Desktop Protocol) sessions, blocking unauthorized connection attempts.
NLA adds another layer of security by requiring credentials before a session is established, and can be paired with access management tools to apply least privilege across accounts.
How NLA Works
NLA uses CredSSP (Credential Security Support Provider), a protocol that encrypts and securely transmits the client's credentials to the server, preventing sensitive information from being exposed during transmission. The server verifies the credentials before allowing the session to proceed, ensuring only authenticated users can establish remote desktop connections.
Security Benefits
NLA reduces the risk of unauthorized access, conserves server resources, and protects against attacks like credential interception and denial of service. By requiring authentication before a full RDP session is established, NLA prevents attackers from exploiting pre-authentication vulnerabilities.
Without NLA, older RDP implementations rely on weak encryption and may not enforce critical protections. Without modern TLS configurations, attackers can intercept sessions or trigger pre-authentication flaws. Cybercriminals exploit RDP through brute force attacks against weak authentication, unencrypted connections that expose credentials, and direct internet exposure without proper access controls.
Security-focused RDP implementations include gateway solutions, proxy services, and access management platforms that add authentication layers, audit capabilities, and advanced monitoring features alongside NLA.