Arch Linux

icelord

Member

Registered: 2024-04-10

Posts: 25

Openvpn says that there is no tun, but there is.

So I start openvpn as usual and I get this:

ERROR: Cannot open TUN/TAP /dev/net/tun: No such device (errno=19)

Then I check /dev/net/ and there it is:

tun

I don't even know where to start.

loqs

Member

Registered: 2014-03-06

Posts: 17,581

Re: Openvpn says that there is no tun, but there is.

How do you start openvpn?  If you start a service that could use a separate namespace or sand boxing that would prevent it seeing /dev/net/tun on the host.

icelord

Member

Registered: 2024-04-10

Posts: 25

Re: Openvpn says that there is no tun, but there is.

I am using Hack The Box VPN so I follow their instructions and:

sudo openvpn starting_point_bla_bla_bla

This always works so I don't know why the case could have been different this time?

Well anyway, It runs fine now but it would be nice to know why this happend.
Could this be a problem on openVPN's side? It fixed itself without a pacman -Syu.

loqs

Member

Registered: 2014-03-06

Posts: 17,581

Re: Openvpn says that there is no tun, but there is.

Well anyway, It runs fine now but it would be nice to know why this happend.

What fixed it?

icelord

Member

Registered: 2024-04-10

Posts: 25

Re: Openvpn says that there is no tun, but there is.

I am not sure, I just booted up my PC this morning and It worked.

loqs

Member

Registered: 2014-03-06

Posts: 17,581

Re: Openvpn says that there is no tun, but there is.

Possibly a kernel module mismatch that was fixed by the reboot?

icelord

Member

Registered: 2024-04-10

Posts: 25

Re: Openvpn says that there is no tun, but there is.

Interesting, have you had any run-ins with something like this?

loqs

Member

Registered: 2014-03-06

Posts: 17,581

Re: Openvpn says that there is no tun, but there is.

Never encountered "No such device (errno=19)" when the device node is there.