Debian – Cannot open TUN/TAP dev /dev/as0t0: No such file or directory (errno=2)

debianopenvpnopenvzvps

I just attempted to install OpenVPN Access Server on my Debian VPS that uses OpenVZ. It installed fine, however when I try to start it from the administration panel, I get these errors:

process started and then immediately exited: ['Sat Sep 22 19:14:33 2012 Cannot open TUN/TAP dev /dev/as0t0: No such file or directory (errno=2)']
service failed to start or returned error status
process started and then immediately exited: ['Sat Sep 22 19:14:33 2012 Cannot open TUN/TAP dev /dev/as0t1: No such file or directory (errno=2)']
service failed to start or returned error status
process started and then immediately exited: ['Sat Sep 22 19:14:33 2012 Cannot open TUN/TAP dev /dev/as0t2: No such file or directory (errno=2)']
service failed to start or returned error status
process started and then immediately exited: ['Sat Sep 22 19:14:33 2012 Cannot open TUN/TAP dev /dev/as0t3: No such file or directory (errno=2)']
service failed to start or returned error status
process started and then immediately exited: ['Sat Sep 22 19:14:33 2012 Cannot open TUN/TAP dev /dev/as0t4: No such file or directory (errno=2)']
service failed to start or returned error status
process started and then immediately exited: ['Sat Sep 22 19:14:33 2012 Cannot open TUN/TAP dev /dev/as0t5: No such file or directory (errno=2)']
service failed to start or returned error status
process started and then immediately exited: ['Sat Sep 22 19:14:33 2012 Cannot open TUN/TAP dev /dev/as0t6: No such file or directory (errno=2)']
service failed to start or returned error status
process started and then immediately exited: ['Sat Sep 22 19:14:33 2012 Cannot open TUN/TAP dev /dev/as0t7: No such file or directory (errno=2)']
service failed to start or returned error status

Is there a solution for this?

Best Answer

I had similar problem when trying to install OpenVPN on OpenVZ. You have good information at: http://wiki.openvz.org/VPN_via_the_TUN/TAP_device

Your problem could be:

  • tun module is not loaded on HW-node. If you rent a VPS ask your VPS-provider for tun-device. Otherwise follow instruction how to install tun-module at HW-node.
  • CT has not rights for TUN/TAP device. Follow instruction in above doc.

I can also recommend OpenVPN page about OpenVPN/OpenVZ

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