Every organisation works with people who aren’t employees. Contractors. Consultants. Managed service providers. Vendors. Maintenance companies. Auditors. Each of these relationships involves a genuine business need for access to something inside your environment — and an equally genuine need to make sure that access goes no further than it should.
This is one of the most persistent and underappreciated challenges in enterprise security. And it’s one that TAC solves in a way that no VPN, no shared account, and no generic identity platform can match.
The Problem with Traditional Third-Party Access
When organisations need to give a third party access to something, the options have traditionally been unappealing. VPN access is blunt — it grants network-level access that is almost always broader than the relationship requires. Shared accounts are a compliance nightmare. Custom portals take months to build and maintain. And “just send them the URL and a login” creates ungoverned access that nobody is tracking.
The result is a patchwork of workarounds that security teams spend years trying to clean up — contractors with broader access than intended, service accounts that outlive the relationship, and legacy permissions that nobody has the confidence to revoke. TAC takes a fundamentally different approach. Rather than granting network access and hoping the boundaries hold, it grants access only to specific applications — enforced at the proxy layer, on every request, in real time.
A Portal Sized Exactly to the Relationship
When a third-party user authenticates to TAC, they see a portal. But unlike an employee’s portal — which might contain dozens of applications — a contractor’s portal contains exactly what they need for their role. Nothing more.
An HR consultant brought in for a six-month engagement might see an HR management system, a personnel records database, and a reporting tool. They don’t see the finance applications. They don’t see the engineering tools. They don’t see anything outside the scope of their work — because nothing outside the scope of their work is published to their portal.
In each case, the portal is the boundary. There is no network-level access to explore. There is no adjacent system to accidentally stumble into. The entire access surface is defined, explicit, and enforced.
When the Access Surface Is a Single Application
For some third-party relationships, the appropriate access isn’t a small portal — it’s a single application. TAC handles this just as cleanly. A user whose role requires access to one system gets a portal with one icon. One click, one connection, one scope. The rest of the organisation’s infrastructure doesn’t exist from their perspective. This level of precision — access to exactly one thing, enforced at the infrastructure level — is exactly what regulators and auditors want to see, and exactly what most organisations struggle to demonstrate with traditional access approaches.
Going Even Further: Direct Application Access Without a Portal
For some third-party relationships, even a single-application portal is more than is needed. TAC can publish an application directly — accessible via its own URL — without presenting the user with a portal at all. The contractor simply navigates to the application link, authenticates, and lands directly in the tool they need. There is no portal to navigate, no icons to click, no interface to learn.
This streamlines access even further for relationships where simplicity matters most. A field technician who needs to reach a single monitoring console once a week doesn’t need a portal — they need a link, a login, and immediate access to that one thing. TAC makes that possible while still enforcing all the same authentication, device posture, and policy controls that apply to every other access request. The experience is simpler; the security is not diminished.
Real-World Scenarios: Precision Access in Practice
The HVAC Maintenance Company
A facilities management company maintains the heating, ventilation, and air conditioning systems across your office estate. They need remote access to the building management console to run diagnostics, adjust settings, and respond to alerts. They have no legitimate business need to access anything else in your environment.
With TAC, the HVAC company’s technicians authenticate with their own credentials and are presented with a portal containing a single application: the building management system. They can connect to it, do their work, and disconnect. At no point do they have network-level access to anything else. Your file servers, your business applications, your cloud platforms — none of it is reachable from their session.
This matters more than it might appear. Building management systems are a well-documented entry point for attackers who compromise third-party maintenance vendors — the infamous Target breach in 2013 began with HVAC contractor credentials. TAC doesn’t just limit what the contractor can reach; it limits the blast radius if those credentials are ever compromised.
The Physical Security Provider
A contracted security company monitors your CCTV systems and manages access control for your physical premises. Their operators need to view camera feeds and manage door access schedules — nothing else. TAC publishes the security management console and the camera viewing platform to their portal. When a security operator logs in — with MFA enforced, device posture checked — they see those two applications and nothing beyond them. The logical separation is complete and auditable, demonstrable to insurers and regulators without relying on network diagrams that may or may not reflect reality.
The HR Consultant
An external HR consultancy is engaged to assist with a compensation review and talent mapping exercise. Their consultants need access to the HR information system, the compensation management platform, and relevant personnel data. They don’t need access to IT systems, financial platforms, or operational tools.
TAC provides a portal scoped precisely to those applications. The consultants work within that boundary for the duration of the engagement. When the engagement ends, access is revoked by removing the policy — cleanly, completely, without chasing down VPN accounts, Active Directory entries, or SaaS memberships across multiple systems. The offboarding is as simple as the onboarding.
The Software Development Partner
An external development agency building a new customer portal needs access to development and staging environments, code repositories, and specific APIs — not production systems, customer data, or internal business applications. TAC publishes those specific environments to the agency’s portal. Developers authenticate with strong MFA, device posture is validated, and they work within a precisely defined scope. If access needs change — perhaps production access is needed briefly for a deployment — the policy is updated centrally and takes effect immediately, with a complete audit trail of who had access to what and when.
Identity Without the Migration
One of the practical challenges of managing third-party access is identity. Contractors often can’t be given corporate email accounts. They may already have credentials from their own organisation. Building a parallel identity infrastructure for every type of external relationship is expensive and operationally complex.
TAC integrates with multiple identity sources simultaneously. Third-party users can authenticate through your organisation’s identity provider, their own identity provider via federation, or a local credential store maintained specifically for externals — all governed by the same policy engine, all producing the same granular access control. There is no need to provision corporate accounts for contractors or add them to your Active Directory.
MFA and Device Posture Apply to Everyone
A common gap in third-party access programmes is the assumption that security controls applied to employees don’t need to apply equally to outsiders. In practice, the opposite is often true — third-party accounts are disproportionately targeted precisely because they tend to have weaker controls.
TAC applies the same authentication and posture requirements to third-party users that it applies to everyone else. MFA is enforced at login. Device posture checks can be applied, ensuring that a contractor connecting from an unpatched or non-compliant device is denied access until compliance is achieved. These controls aren’t optional add-ons requiring separate configuration for each vendor relationship — they apply consistently, from the same policy engine, across every user whether internal or external.
A Complete Audit Trail
Every access request through TAC — regardless of whether it comes from an employee or a contractor — is logged. Who accessed what, when, from which device, from which location, and what policy decision governed that access. This audit trail is unified across all users and all applications in the portal.
When an auditor asks for evidence of what access the HVAC vendor had over the past twelve months, the answer is a query, not a manual reconstruction from multiple system logs. When a security incident requires understanding what a specific contractor account did during a particular window, the information is complete, accurate, and immediately available. This is what mature vendor access management looks like — and what regulators across SOC 2, ISO 27001, HIPAA, and other frameworks are increasingly expecting to see.
Clean Onboarding, Clean Offboarding
The lifecycle of third-party access has two ends, and both matter. Getting contractors set up quickly at the start of an engagement has real commercial value. Terminating access cleanly at the end — or when the relationship changes — has real security value.
With TAC, both ends are managed centrally. Onboarding a new contractor means creating credentials or federating their identity, and applying the relevant access policy. Offboarding means removing that policy — a single operation that takes effect immediately across every application in their portal. For organisations with dozens or hundreds of active vendor relationships, this operational simplicity is the difference between access management that actually happens and access management that exists only on paper.
The Bottom Line
Third-party access is one of the highest-risk areas of enterprise security — and one of the areas where the gap between policy intent and operational reality is most likely to cause problems. TAC closes that gap by making precise, granular, auditable access control as easy to implement for a contractor as it is for a full-time employee.
Whether the requirement is a single application for a maintenance vendor, a focused portal for a specialist consultant, or a carefully scoped environment for a development partner — TAC delivers it cleanly, securely, and without the operational overhead that makes good third-party access management so difficult to sustain.
Every third party, in their lane. That’s the TAC difference.