Xen users - Aug 2012 - unable to shutdown or reboot VM in XCP 1.5

Hello,
I''m using XCP 1.5 beta.
During using it found big trouble: I can''t reboot or shutdown VM.

[root@xen11 bin]# xe vm-shutdown uuid=ad5e181b-9dfe-9372-84be-92c7c95caa13
VM failed to shutdown before the timeout expired
vm: ad5e181b-9dfe-9372-84be-92c7c95caa13 (Debian)
timeout: 3600.

Does anybody know how to resolv the problem?

Thank you.