Four tests every VPN alternative should pass

Let's be honest: nobody searches for "VPN replacement" because their VPN is running with no issues. beautifully. They search because the gateway needs another emergency patch, remote users are complaining about speed, or an auditor asked why a contractor's laptop can see half the network.

There's no shortage of answers, and nearly all of them point to the same category: zero trust network access. That's a real step forward. But asking what each option removes is also important, because some VPN replacements swap out the path and keep the front door.

VPNs solved yesterday's remote access problem pretty well

For a long time, the VPN was exactly the right tool. Applications lived in one data center, most people worked in the office, and remote access meant extending that office network to a laptop somewhere else. Authenticate once, join the network, get to work.

Two traits of that design now work against it. A VPN gateway has to listen on the public internet for incoming connections, so anyone scanning the internet can find it too. Attackers have noticed. In fact, Google's Threat Intelligence Group found that more than 60% of the zero-days exploited against enterprise technologies in 2024 hit security and networking products. And once a user connects, they usually reach far more of the network than their job requires. So does anyone holding their credentials.

Zero trust access shrank the blast radius

Zero trust network access (ZTNA) took on the second problem directly. Instead of network-wide access, users get specific paths, often after a device posture check. For teams that needed to move off their VPN without a six-month rollout, that's a genuine upgrade.

The first problem doesn't go away, though. Depending on the architecture, a VPN replacement may still bring:

• A terminator or gateway your team deploys, patches and monitors inside your network

• Trust tied to the device and session, which stays live until an admin revokes it

• A point where traffic is decrypted for inspection

• Encryption that isn't built for post-quantum threats

None of these make zero trust access a bad choice. But they do define how much of the VPN's exposure the replacement retires.

Four tests separate a replacement from a rebrand

Before choosing an alternative, put each option through four questions:

• Reachability: Can anything on your network be discovered or connected to from the internet?

• Trust scope: Does access attach to a device, a user or the specific process doing the work?

• Session lifespan: Does access expire on its own, or wait for someone to notice a problem?

• Visibility: Can the vendor, anyone at a relay point or a future quantum computer read your traffic?

An option that answers "nothing, the process, on its own, nobody" has retired the VPN's exposure. Any other combination has moved some of that exposure to a new address.

Terniion passes by removing the target

Terniion, Xiid's secure network access control platform, starts with the first question. Both sides of every connection are outbound-only. Each endpoint's agent dials out over port 443 to a blind intermediary called the Connector Mesh, which joins the two halves into one tunnel without ever holding the keys to decrypt it. Neither endpoint opens an inbound port to the network, so there's nothing for a scanner to find. Teams can use the Xiid-managed Connector Mesh or self-host it to keep every packet inside networks they control. Your infrastructure becomes undiscoverable.

Access is scoped to the process rather than the device. Terniion opens a connection between two specific processes for one task and closes it when the task ends, which leaves no standing session to ride. 

Every byte passes through three nested layers of security: TLS 1.3 between each endpoint and the relay, a hybrid post-quantum key exchange between the two endpoints, and AES-256-GCM encryption of the data itself. The end-to-end keys exist only on the two endpoints, so neither the Connector Mesh nor Xiid can read the traffic. Every key exchange is post-quantum, which takes harvest-now, decrypt-later off the table.

Where other approaches add a better lock, Terniion removes the door.

One contractor, one database, and one task

Picture a vendor engineer who needs two hours on an internal database for scheduled maintenance. On a VPN, they authenticate and land on a network segment that includes the database and whatever else shares it. Their access lasts until someone remembers to disable it.

With Terniion, the engineer's database client connects to that one database process. Nothing else on the network is reachable from their machine, there's no password to steal, and the tunnel closes when the work is done. If their laptop is compromised next week, the attacker finds no open path back in.

The same model holds where VPNs struggle most: on-prem systems, OT environments, and fully air-gapped networks, which Terniion supports out of the box.

Migration starts with a single application

Replacing remote access doesn't require a rip-and-replace multi-week or months-long project cycle. Terniion is a software-only overlay that deploys in about 90 minutes and runs alongside your existing VPN or zero trust tools. Most teams start with one high-value application, prove the access model, then expand.

Terniion also holds a DoD Authority to Operate validated by the U.S. Air Force Research Laboratory, which helps when the security review lands on your desk.

The right replacement retires the exposure entirely

Moving off a VPN is the right call. The harder question is what the replacement leaves behind. Terniion removes the front door, the standing session, and the decryption point together, so attackers have nothing to find, nothing to ride, and nothing to read.