When should organisations prioritise relay and coercion controls?

Organisations should prioritise them whenever privileged Windows infrastructure is present, because a single relayable trust path can expose the domain controller itself. If attackers can force outbound authentication from a trusted system, the blast radius is much larger than a normal credential theft event. That is a high-priority identity risk.

Why This Matters for Security Teams

Relay and coercion controls matter when Windows trust paths can be abused to make one system authenticate on behalf of another. In that situation, attackers are not just stealing a password or token; they are turning the trust architecture itself into an entry point. NHI Mgmt Group research shows that 80% of identity breaches involved compromised non-human identities such as service accounts and API keys, which is why identity paths should be treated as attack surfaces, not just administration plumbing. Current guidance suggests pairing this with NIST Cybersecurity Framework 2.0 to anchor detection, protection, and response around identity risk.

The practical problem is that coercion attacks often succeed through ordinary enterprise features like NTLM fallback, unconstrained delegation, print and name resolution services, or over-permissioned service accounts. Teams that focus only on password strength or MFA miss the point if a server can still be induced to authenticate outward and expose a privileged path. This is why the Ultimate Guide to NHIs — Standards is useful as a governance baseline: it frames authentication, access, and lifecycle control as continuous risk management, not a one-time hardening exercise. In practice, many security teams encounter relay risk only after lateral movement has already begun, rather than through intentional design-time review.

How It Works in Practice

Prioritisation should start with the systems that can authenticate to something more valuable than themselves. Domain controllers, identity management servers, file servers, management jump hosts, and workloads with delegated admin rights deserve the first review because a single coerced outbound authentication from one of those assets can become domain-wide compromise. The core defensive move is to remove or constrain the conditions that make relay possible: disable legacy authentication where feasible, reduce NTLM exposure, enforce signing and channel protections, and block untrusted name resolution paths that help attackers capture or redirect traffic.

For NHI-heavy environments, the issue is not limited to human logons. Service accounts, machine accounts, and automation identities frequently inherit trust relationships that are invisible in day-to-day operations. That makes lifecycle discipline important: inventory the identities, map where they authenticate, and identify where privilege can be delegated or reused. The Ultimate Guide to NHIs — Standards and NIST Cybersecurity Framework 2.0 both support this view by treating access paths, asset visibility, and response readiness as core controls rather than optional hygiene.

• Prioritise domain controllers and identity services first, then move outward to management and automation tiers.
• Eliminate or tightly restrict protocols and features that allow relay, coercion, or anonymous redirection.
• Review delegated authentication paths for service accounts, not just interactive admin users.
• Use logging and detection to flag unusual outbound authentication from high-value systems.
• Document which identities can be coerced into authenticating elsewhere and isolate them accordingly.

These controls tend to break down in hybrid environments with legacy Windows dependencies because protocol downgrades, unmanaged devices, and exception-driven operations keep reintroducing relayable paths.

Common Variations and Edge Cases

Tighter relay and coercion controls often increase operational overhead, requiring organisations to balance service continuity against the reduction in attack paths. That tradeoff is real in environments that still depend on legacy SMB, NTLM, old print workflows, or third-party appliances that cannot support modern protections. In those cases, best practice is evolving rather than settled: current guidance suggests isolating the risky segment, monitoring it aggressively, and removing the exception as soon as the dependency can be retired.

Edge cases also appear where privileged access is highly automated. Scheduled tasks, backup agents, remote management tools, and orchestration platforms may fail if strict authentication controls are turned on without testing. The answer is not to exempt them permanently, but to redesign them so they use explicit trust, constrained delegation, and short-lived credentials rather than ambient authority. That is where the NHI view is helpful: if an identity can act on its own, it should be governed as a workload with a known lifecycle, not as a static exception. For teams building that posture, the Ultimate Guide to NHIs — Standards remains the clearest operational reference.

There is no universal standard for when every relay path must be removed outright, but the rule of thumb is simple: if the system can reach sensitive authentication boundaries, it should be treated as high priority. That is especially true where a successful coercion could pivot into domain controller access or expose NHI-backed automation at scale.

Related resources from NHI Mgmt Group

• How should security teams reduce NTLM relay risk in Active Directory?
• When should organisations prioritise Zero Standing Privilege for non-human identities?
• Should organisations prioritise external exposure or internal credential governance first?
• Should organisations prioritise reducing secret reuse over faster scanning?