Cannot open TUN/TAP dev /dev/tun1: Device busy (errno=16)

[socket]

Hi all,

I am encountering this error trying to configure an OpenVPN client:

Code Select Expand

2022-09-03T18:36:09 Notice openvpn Exiting due to fatal error
2022-09-03T18:36:09 Error openvpn Cannot open TUN/TAP dev /dev/tun1: Device busy (errno=16)

I looked at this github issues:

• https://github.com/opnsense/core/issues/3223

and also these other thread:

• Cannot open TUN/TAP dev /dev/tun1: Device busy (errno=16)
• [SOLVED / bug found] OpenVPN - unable to contact Daemon
• [SOLVED / bug found] OpenVPN strange issue (Service not running according to messages, but it works)
• and some other

I can't find out why it is not working.
I checked with ps aux | grep openvpn and there are no running processes
I tried pkill -9 openvpn just in case, but did not help
I tried rebooting the box and did not help

Box is PC Engine APU2 (forgot which revision)

Running OPNsense 22.7.2-amd64

Should I open an issue on github?
Can somebody help me understand what I am doing wrong?

Thank you very much