See this linkļ¼ http://n40lab.wordpress.com/2013/01/05/unable-to-add-bridge-brx-port-vnetx-invalid-argument-or-operation-not-supported/ maybe could help you. Suggest you use neutron as nework service , not nova-network. >Hello, I'm trying to create an instance in the compute node using > nova-network but this error occurs: >*/var/log//nova/nova-compute.log* >*/var/log/libvirt/libvirtd.log* >http://paste.debian.net/83945/ >*# virsh list* >Id Name State >---------------------------------------------------- >*# virsh list --inactive* > Id Name State >---------------------------------------------------- >I do not understand why virsh list is empty >*uname -a* >Linux compute01 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64 GNU/Linux >can someone help me with this please? Thanks!