We are doing what we can to help users in Iran get connected to the VPN but there are currently no guarantees that it will work because of how heavily restricted the internet there is.
Here are some suggestions to try on your end to see if you can get connected.
First off, please try connecting to multiple servers to see if any of them will work for you.
If this doesn't work for you, please try using the other protocols that are available like WireGuard, UDP, TCP and IKEv2 and see if any servers work using those.
If you are using an Android Device, you can also try the Stealth protocol. You can do this by going to Preferences > Connection and using these settings:
Connection Mode: Manual
After making those changes, try connecting to several servers again to see if any of them connect.
If you're still having problem, see if you can get onto another network. For example switch off of WiFi and use cellular data or connect to a different WiFi if you can. Then try the same steps above to see if you can get connected to the VPN.
If you are still running into issues after all this, please let us know by submitting a ticket and we'll see what else can be done.