Web Reference: Dec 22, 2025 · If you run VPN software, WireGuard, OpenVPN, or any tunneling-based network service on Linux, you will eventually encounter this error: Cannot open TUN/TAP dev /dev/net/tun: Operation not permitted This message commonly appears on VPS servers, inside Docker containers, or in Proxmox LXC environments. Dec 20, 2025 · You must be a member of the local Administrators group on the server where you want to open the console, and either a member of the Azure DevOps Server Administrators group or your Edit Server-Level Information permission must be set to Allow. Apr 28, 2024 · As a side note, I changed the gluetun behavior a bit in e07966f so that it only attempts to create the tun device if it doesn't exist. If it already exists and cannot be accessed for some reason, it just terminates and logs the error.
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