TUN/TAP is not enabled by default on your VPS, however, you can enable it yourself via your SolusVM login. You can follow the below instructions to enable TUN/TAP support.
1) Login to your SolusVM VPS account, here.
2) Select the VPS that you wish to enable TUN/TAP support for by clicking on the Manage button.
3) Click on Settings under Controls.
4) Click on the Enable TUN/TAP button.
To verify that TUN/TAP support has been enabled properly, you can run the below command in SSH. The output you should receive is also shown.
[root@server ~]# cat /dev/net/tun
cat: /dev/net/tun: File descriptor in bad state