What is a Session
A session is an authorized connection to an account from a specific device. When you log into Telegram, a session is created that allows you to use the account without re-entering the code. One account can have multiple active sessions: phone, computer, web version.What a Session Contains
Each session contains:- Auth Key — a cryptographic key for encrypting traffic. Generated once when the session is created.
- Device Info — information about the device (model, OS, client version).
- IP Address — the address from which the session was created and last activity.
- Time — when it was created and when there was last activity.
Auth Key is the main thing. Whoever owns the key controls the session. That’s why session files (.session) need to be kept secure.
Lifecycle
Creation — you enter the number, get the code, log in. Telegram creates a session. Active — the session works, you use the account. Inactive — you haven’t logged in for a long time. The session is still alive, but Telegram may terminate it after several months. Terminated — the session no longer works. Re-authorization is required.Why a Session May Drop
| Reason | What happens |
|---|---|
| You clicked “Terminate session” | Session closes. |
| Reset all sessions | All devices are logged out. |
| Telegram detected an anomaly | Sudden IP/region change, suspicious activity. |
| Long inactivity | Telegram terminates inactive sessions (usually after 6 months). |
| Account blocked | All sessions are terminated. |
Where to View Sessions
In Telegram: Settings → Devices (or Settings → Privacy → Active Sessions). There you can see:- All active sessions.
- Device and IP of each session.
- When the last activity was.
Multiple Sessions at Once
Telegram allows multiple active sessions. This is normal:- Main phone.
- Work computer.
- Tablet.
Sessions are independent of each other. If one is terminated or blocked, the others continue to work.
Next Steps
Environment
How IP and region affect the session.
Troubleshooting
What to do if a session drops.