Staying connected in Iran takes a VPN that changes its approach as fast as the filtering does. Iran's filtering combines blocked websites and apps, deep packet inspection that recognises VPN protocols, and periods when international traffic is heavily throttled. Under those conditions, classic protocols and single V2Ray configs keep failing, and people spend their evenings looking for the next working config. ZoltVPN's CyberPort AI is designed for this: it chooses between 10 connection models based on your location, your provider and live performance, switches automatically when one is blocked or slow, and remembers what works on each network. The app is also available in Persian.
How internet filtering works in Iran
Filtering in Iran is layered. Understanding the layers explains why one day everything works and the next day nothing does.
- Blocked sites and apps. Many international platforms, including social networks, messaging apps and news sites, are filtered. Requests to them are redirected, reset or dropped.
- Deep packet inspection. Equipment on provider networks examines traffic patterns and recognises common VPN protocols by their fingerprints. Once recognised, the traffic is throttled or cut. Our explainer on deep packet inspection covers the technique in detail.
- Throttling of international traffic. At times, connections to servers outside the country are slowed sharply, while domestic services stay fast. This can make a working VPN feel broken.
- Tighter periods. Around sensitive events, filtering becomes stricter, sometimes allowing only a narrow range of traffic types through. In the most severe cases, international connectivity is largely shut down while the domestic network keeps running.
Mobile and home internet are different networks
Mobile operators and fixed-line providers apply filtering differently, and at different times. It is common for a VPN to work on home ADSL or fibre and fail on mobile data, or the reverse. Each network you use needs to be treated separately.
Why your configs and VPNs keep dying
Most people in Iran have used a free V2Ray, VLESS or VMess config from a Telegram channel at some point. These can work well, for a while. The problem is how a typical setup is built: one config, one server, one fixed transport. When that path is detected or throttled, the connection slows down or stops, and you have to find a new config. Free configs are also shared by thousands of people, so the server is overloaded long before it is blocked. A static setup like this is slower in practice than CyberPort AI, because it has no way to move when its single path is squeezed. We cover this in depth in V2Ray vs CyberPort AI.
Classic VPN protocols have a different problem: they are easy to recognise.
| Protocol or setup | Detectable by DPI | What happens when blocked | Typical result in Iran |
|---|---|---|---|
| OpenVPN | Yes | Throttled or reset; TCP mode adds "TCP over TCP" slowdowns | Very slow or no connection |
| WireGuard | Yes, fixed handshake pattern | UDP traffic dropped | Connects but no traffic, or fails |
| IKEv2, L2TP, PPTP | Yes | Blocked outright | Rarely usable |
| Free V2Ray, VLESS or VMess config | Depends on the config | That server is throttled or blocked | Works for hours or days, then dies |
| CyberPort AI | Chooses among 10 models | Switches automatically in seconds | Built to stay connected at usable speed |
How CyberPort AI handles Iran's networks
CyberPort AI is ZoltVPN's adaptive connection engine. It isn't one protocol, and it isn't one config. It constantly measures how your connection performs and makes three decisions for you:
- Which connection model to use. It chooses among 10 models based on your location, your internet provider and how each model is performing at that moment.
- When to switch. If the current model is blocked or slows down, it moves to another one automatically, usually within seconds. You don't paste a new config.
- What to remember. It keeps track of what works on each network. Your home internet and your mobile operator each get their own best starting point.
For you, the difference is simple: you press connect, and the work of finding a path that gets through happens in the background.
A routine that keeps you connected
Install and update while the internet is good. During tight periods, app stores and websites can be hard to reach. Keep the app updated whenever you have a good connection. On Android, ZoltVPN is available from Google Play or as a direct download from our site, which helps when the store is hard to reach.
Connect once on every network you use. Home Wi-Fi, mobile data, your workplace, your parents' house. Each first connection teaches the app what works there.
Leave it on automatic. Choosing a fixed server or forcing one method removes the main advantage of an adaptive engine.
Match your expectations to the moment. When international bandwidth is throttled, lower your video quality and use text messages instead of video calls. A working connection at a modest speed is better than repeated reconnects.
Avoid unknown "VPN" apps. Apps shared as files in groups and channels can contain malware or collect your data. Install from an official store or from the provider's own website.
Help your family. Parents and relatives are often the ones stuck when filtering changes. The app is available in Persian, English, Arabic, Chinese, Turkish and French, so you can set it up in the language each person is comfortable with.
When the internet is shut down
It is worth being honest about the limits. A VPN needs some path to the outside world. If international connectivity is fully cut, no VPN can create a connection that doesn't exist. During partial shutdowns, when some international traffic still passes, an adaptive engine has the best chance of finding it. When normal access returns, give the app a minute to re-evaluate the network before judging it.
A note on the law
Rules on internet use in Iran are strict and can change. Readers should follow local laws wherever they are.
FAQ
Why does my VPN work on Wi-Fi but not on mobile data?
Your mobile operator and your home provider filter traffic differently and at different times. A method that passes on one can be throttled on the other. CyberPort AI evaluates each network separately and remembers what works on each one.
Is a free V2Ray config good enough?
It can work for a while, but a typical free config is one server and one fixed transport, shared by many people. When it is throttled or blocked, it slows down or stops, and you have to find another. CyberPort AI chooses among 10 connection models and multiple servers and switches automatically.
Does ZoltVPN have a Persian app?
Yes. The app is available in Persian, and our Persian home page has information in Persian. You can also read about the service on our VPN for Iran page.
Can any VPN work during a full internet shutdown?
No. If international connectivity is completely cut, there is no path for a VPN to use. During partial disruptions, an adaptive engine can often still find a way through.
Get set up while your connection is good: download ZoltVPN and start a 7-day free trial, no card needed.
