| Error | Likely Cause | Solution | |-------|--------------|----------| | “Cannot connect” | Censorship upgraded or port blocked | Enable “Obfuscated Tunnel” in settings → Connection. | | “Windows protected your PC” | SmartScreen for an unsigned/rare app | Click “More info” → “Run anyway” (only if downloaded from official source). | | Antivirus deletes file | False positive | Add to AV exclusion list or restore from quarantine. | | Crash on launch | Corrupted download or missing DLLs | Re-download from official site, disable VPN conflicts. |

Using Psiphon 3 is legal in most countries, but in nations with strict censorship (e.g., China, Iran, North Korea), possessing or using circumvention tools can lead to legal penalties. You are responsible for complying with your local laws.

Psiphon uses a combination of different technologies to bypass firewalls, including:

When you run the Psiphon 3 EXE, it connects to a network of servers worldwide. It then dynamically selects the best protocol to evade deep packet inspection (DPI) used by governments, ISPs, or school/work networks.