Comment 8 for bug 517478

Bug #474107 does not fix it for me since libvirt itself (virsh) is using -q anyway on new releases:

LIBVIRT_DEBUG=1 virsh -c qemu+ssh://root@xxxx/system

It seems that "nc -q" code is present on libvirt itself too:

13:55:49.688: debug : doRemoteOpen:564 : proceeding with name = qemu:///system
13:55:49.688: debug : virExecWithHook:640 : ssh -l root xxxx nc -q 0 -U /var/run/libvirt/libvirt-sock
13:55:49.701: debug : remoteIO:8431 : Do proc=66 serial=0 length=28 wait=(nil)
13:55:49.702: debug : remoteIO:8493 : We have the buck 66 0xb76f8008 0xb76f8008
13:55:50.049: debug : remoteIOEventLoop:8378 : Giving up the buck due to I/O error 66 0xb76f8008 (nil)
13:55:50.049: debug : do_open:1126 : driver 4 remote returned ERROR

Putting a nc binary that supports "-q" flag under /usr/local/bin fixes it for me, see (as zigi wrote):

http://bugs.centos.org/view.php?id=4188