[libvirt] client hang in virDomainCreateXML

Hi, We are using Ubuntu 10.04 eucalyptus 1.6.2 and libvirt 0.7.5. We found eucalyptus-nc sometimes hangs in virDomainCreateXML, and never gets response from libvirtd. After 2 days of investigation, I found there is another libvirt client connects to libvirtd 'qemu:///system', which is the same URI as eucalyptus-nc. The bug never shows after I disabled the client. My question is: 1, can I have multiple clients connect to qemu:///system? 2, is this an bug in libvirt and has it been fixed? Thanks a lot