Bug related to bridge definitions existing in /etc/sysconfig/network-scripts, Virtual Machine Manager stops starting w. error message. How to reproduce: - installation or upgrade SL7.1 - copy a bridge definition into /etc/sysconfig/network-scripts, e.g. DEVICE=kvmbr0 TYPE=Bridge BOOTPROTO=none ONBOOT=yes BRIDGE="eth0" IPADDR=192.168.55.31 NETWORK=192.168.55.0 PREFIX=25 BROADCAST=192.168.55.127 IPV6INIT=no NM_CONTROLLED=no NOZEROCONF=yes USERCTL=no PEERDNS=yes - start Virtual Machine Manager. Virtual Machine Manager does not start, but shows an error message, e.g. "Error polling connection 'qemu///system': (interface_definition):7: Extra content at the end of the document </interface><interface type="bridge" name="vdslbr0"> ----------------" You don't need to start or use this bridge, existence of a file starting with ifcfg- containing the line "TYPE=Bridge" will do. As a workaround comment out all TYPE=Bridge lines before starting Virtual Machine Manager, after start of VMM the comment marks can be removed again. There must be a broken ifcfg- file check before in VMManager before it starts. Probably nobody uses these bridge definitions as there is an age-old bug in initscripts, which successfully prevents adding and deleting of bridges. (See also bug report id 0007594, https://bugs.centos.org/view_all_bug_page.php, set filter to Reporter: omb) As I can test SL7.1 only and not R..7.1 I cannot decide if this bug should be reportet to R..H directly. omb