6 min read
Iran's filtering differs from China's and Russia's in one detail that confuses people more than anything else: it doesn't block the connection, it breaks it. The app shows "connected", authentication passes, there's no error — and data simply stops flowing. People spend an hour checking settings that were fine all along. Here's how the system works, what survives it, and where any VPN's capabilities end.
The filtering infrastructure is run by TIC, the state telecommunications company. In 2026 three features define it.
1. Machine-learning traffic analysis. The system identifies most commercial VPN protocols within seconds. Not from address lists, but from how a connection behaves.
2. Breaking encryption negotiation instead of blocking. Rather than closing an address, the equipment interferes with establishing the secure channel. The connection formally comes up, then quietly stops carrying data. To the user it looks like a broken app rather than censorship — and that's the point of the technique.
3. Moving from a blacklist to a whitelist. What's explicitly permitted is allowed; everything else is closed by default. That's fundamentally stricter than a model where only listed items are closed. The list of blocked material is vast too: as of 2026 it covers more than 15 million domains, including Telegram, Signal, WhatsApp, Instagram, X, Facebook, YouTube, ChatGPT, Gemini and virtually every international news outlet.
| What you see | What it actually is | What to do | |---|---|---| | Won't connect at all | the server's address is restricted | change server within the location | | "Connected" but no data | encryption negotiation broken | change protocol, then location | | Connects and drops after a minute | protocol identified by behaviour | you need one without a signature of its own | | Works a couple of hours then stops | address listed after analysis | spare address, switch over | | Nothing works, including local sites | network or international links cut | a VPN won't help; wait for restoration |
On 8 January 2026 Iran switched off the internet across the country. Network usage fell by roughly 97%, and the communications minister acknowledged the shutdown was costing the economy $35.7 million a day. The domestic National Information Network was at one point unreachable even from inside the country.
This matters before you choose any service: during a full shutdown no VPN works. A tunnel is a way of carrying traffic over an existing channel. With no channel, there's nothing to carry. Any promise of "works even during a shutdown" is a lie.
What's worth preparing in advance for that scenario: offline maps, saved contacts, downloaded documents, and an agreement with people close to you about how to reach each other when there's no connection.
They all share the same deceptive symptom: the connection succeeds, the data doesn't move.
The class of protocols with no signature of their own, which look like ordinary web traffic.
VLESS with Reality masking — the handshake is performed with a real, widely-visited site whose certificate is used, so there's nothing in the stream to isolate as "VPN traffic". It also protects against active probing where that's in play: the server answers as the genuine site would.
AmneziaWG — WireGuard with an altered packet structure: simpler to configure, weaker masking.
More on the mechanics: what Reality and VLESS are. Comparison: Hysteria2, TUIC and AmneziaWG.
In Iran, unauthorised VPN use has been placed outside the law. That distinguishes the situation both from Russia, where use itself isn't punishable, and from China, where what's mainly regulated is providing the service.
The practical implication for a reader: the cost of a mistake is higher here, and the decision about whether to use one is made by the individual, with an understanding of local rules. We describe how the technology works; we're not urging anyone to break anyone's laws.
The service runs on VLESS with Reality masking — the protocol class with no signature of its own, which therefore survives traffic analysis longer than solutions with recognisable handwriting. The nearest location in the network to Iran is Turkey, giving the lowest latency of the available options. Over a hundred servers, so switching takes a second when one address is restricted. There's automatic reconnection on network changes and a kill switch on Apple devices — if the tunnel drops, traffic stops rather than leaving in the clear.
Download in advance, while you have access:
What we don't promise: operation during a nationwide shutdown — nobody provides that — or a guarantee of availability tomorrow. In this race the only honest promises are the protocol with the best survival record and a supply of spare locations.
How neighbouring systems work: VPNs in the most censored countries and VPN for China.
Why does my VPN say "connected" with no internet? A hallmark of Iranian filtering: the system breaks encryption negotiation, so the connection comes up formally and stops carrying data. Change protocol rather than settings.
Does a VPN work during an internet shutdown? No. A tunnel carries traffic over an existing channel; during a nationwide shutdown there is no channel.
Which country should I connect to from Iran? Turkey — the nearest large hub, around 15 ms of physical latency floor. Europe doubles it.
Can I download the app once I'm in Iran? Don't count on it: app stores are restricted. Install it in advance.
Is using a VPN legal in Iran? Unauthorised use has been placed outside the law. That differs from Russia and China, and the decision is made with an understanding of local rules.
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