Xen users - May 2007 - xmlrpc?

I''m trying to upgrade from 3.0.3 to 3.1.0 on fedora.  When I try to
create a domU, it hangs and stace says the xm create command is
waiting for a response from the xmlrpc.sock socket, which belongs to
xend.  

Can anyone tell me anything about xmlrpc?  What it''s for, why it might
be hanging?  

Thanks
-Dylan

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