When I run the python test code I got the SASL error. But it's ok if I run the C sample code. Do you know the reason?  Here is the message: libvir: RPC error : authentication failed: Failed to start SASL negotiation: -4 (SASL(-4): no mechanism available: No worthy mechs found) Traceback (most recent call last):   File "esxList.py", line 101, in ?     conn = libvirt.openAuth(uri, auth, 0)   File "/usr/lib/python2.4/site-packages/libvirt.py", line 102, in openAuth     if ret is None:raise libvirtError('virConnectOpenAuth() failed') libvirt.libvirtError: authentication failed: Failed to start SASL negotiation: -4 (SASL(-4): no mechanism available: No worthy mechs found) Thanks, -Hubert