How does the VPN client connect to the Cloud? (ports & protocols)
The VPN client is a lightweight application, running in the background on your computer, that enables you to make a secure VPN connection to your devices from within your browser. It uses outgoing port(s) to establish its connection.
Overview
Below is an overview of the ports and protocols that the VPN client utilizes, which can be blocked by the company’s firewall.
| Direction | Port | Transport protocols | Application protocols |
|---|---|---|---|
| Outbound | 443 | TCP | HTTPS, OpenVPN |
| Outbound | 8443(1) | TCP | HTTPS |
(1) Only used when stealth mode is activated for connectivity via a censored internet connection (e.g. when located in China).
The following local ports and protocols are also used, which can be blocked by the computer’s firewall.
| Direction | Port | Transport protocols | Application protocols |
|---|---|---|---|
| Outbound | 443 | TCP | HTTPS, OpenVPN |
| Outbound | 8443(1) | TCP | HTTPS |
| Inbound (from localhost) | 9250 | TCP | HTTPS, WebSocket |
| Inbound (from localhost) | 9251(2) | TCP | OpenVPN Management Interface |
| Inbound (from localhost) | 9255(1) | TCP | HTTPS |
(1) Only used when stealth mode is activated for connectivity via a censored internet connection (e.g. when located in China).
(2) Only for Windows.