VPN adapter missing or "driver not installed" on Windows
Fortis says the network adapter is missing. Here is how to put it back.
Last updated September 25, 2026
Fortis needs a small part of Windows called a network adapter to carry your VPN traffic.
1. Install the adapter from Fortis
The first time you connect, Fortis shows Install the Fortis network adapter. Click Install adapter, then click Yes when Windows asks.
2. Try the other protocol
Choose OpenVPN or WireGuard and connect again. See Change the VPN protocol.
3. Reinstall Fortis
Uninstall Fortis, restart your PC, then install it again from the download page. This puts the adapter back.
4. Remove other VPN apps
Other VPN apps can get in the way. Uninstall the ones you do not use and restart.
Still stuck?
Our support team is available 24/7. Open the chat bubble in the bottom-right corner of this page, or email [email protected] with your device, app version, and the server location you were trying to use.
