Trying to use virsh for hyperv and getting this.

virsh # connect hyperv://
Enter username for [administrator]: administrator
Enter administrator's password for
2013-04-29 10:36:48.690+0000: 13991: error : hypervDebugHandler:1444 : openwsman error: NULL response
error: Failed to connect to the hypervisor
error: internal error Transport error during enumeration: User, password or similar was not accepted (26)

Using libvirt 1.0.4 from source code.
What is going wrong in this hyperv connection ?