Hi, I'm trying to setup an eucalyptus cloud managing my virtual xen nodes. I'm on SLES11, x86_64. I compiled libvirt-0.6.2 with the following configure parameters: ./configure --prefix=/usr --without-storage-iscsi --without-remote --without-sasl --without-openvz --without-storage-disk below the parameters I've set in the /etc/libvirt/libvirt.conf file: listen_tls = 0 listen_tcp = 1 unix_sock_group = "libvirt" unix_sock_ro_perms = "0777" unix_sock_rw_perms = "0777" unix_sock_dir = "/var/run/libvirt" auth_unix_ro = "none" auth_unix_rw = "none" auth_tcp = "none" auth_tls = "none" log_level = 1 log_outputs="0:stderr" as root, I can run "virsh list" or "virsh -c xen+unix:/// list" and it just works, however, I cannot do this as user eucalyptus. The user eucalyptus is a member of the libvirt group. # id eucalyptus uid=1000(eucalyptus) gid=1000(eucalyptus) groups=1000(eucalyptus),0(root),16 (dialout),17(audio),33(video),100(users),1001(libvirt) I ran virsh through strace, to see what happens: strace virsh.bin -c xen+unix:/// list ... open("/proc/xen/privcmd", O_RDWR) = -1 EACCES (Permission denied) ... Shouldn't the permissions of /proc/xen/privcmd be OK due to the libvirt.conf file? However, I changed them, and now the strace output looks like this: chmod 777 /proc/xen/privcmd strace virsh.bin -c xen+unix:/// list ... open("/proc/xen/privcmd", O_RDWR) = 3 ioctl(3, SNDCTL_DSP_RESET, 0x7fff4721a0f0) = 196611 mlock(0x7fff4721a070, 72) = 0 mlock(0x7fff47219f00, 136) = 0 ioctl(3, SNDCTL_DSP_RESET, 0x7fff47219d80) = -1 EACCES (Permission denied) munlock(0x7fff47219f00, 136) = 0 munlock(0x7fff4721a070, 72) = 0 mlock(0x7fff4721a070, 72) = 0 mlock(0x7fff47219f00, 136) = 0 ioctl(3, SNDCTL_DSP_RESET, 0x7fff47219d80) = -1 EACCES (Permission denied) munlock(0x7fff47219f00, 136) = 0 munlock(0x7fff4721a070, 72) = 0 mlock(0x7fff4721a070, 72) = 0 mlock(0x7fff47219f00, 136) = 0 ioctl(3, SNDCTL_DSP_RESET, 0x7fff47219d80) = -1 EACCES (Permission denied) munlock(0x7fff47219f00, 136) = 0 munlock(0x7fff4721a070, 72) = 0 mlock(0x7fff4721a070, 72) = 0 mlock(0x7fff47219f00, 136) = 0 ioctl(3, SNDCTL_DSP_RESET, 0x7fff47219d80) = 0 munlock(0x7fff47219f00, 136) = 0 munlock(0x7fff4721a070, 72) = 0 mlock(0x7fff47219e00, 136) = 0 ioctl(3, SNDCTL_DSP_RESET, 0x7fff47219d80) = 0 munlock(0x7fff47219e00, 136) = 0 close(3) = 0 ... actually, there is no sound card at all, I wonder what the SNDCTL_DSP_RESET is doing there. After the close(3), the virsh is only looking for language to generate the error message: error: failed to connect to the hypervisor Those xen versions are installed: xen-doc-pdf-3.3.1_18546_12-3.1 xen-doc-html-3.3.1_18546_12-3.1 xen-3.3.1_18546_12-3.1 xen-libs-3.3.1_18546_12-3.1 xen-tools-3.3.1_18546_12-3.1 xen-kmp-default-3.3.1_18546_12_2.6.27.19_5-3.1 kernel-xen-base-2.6.27.19-5.1 kernel-xen-2.6.27.19-5.1 xen-devel-3.3.1_18546_12-3.1 any idea what is wrong here? kind regards sebastian