My hwk Upgrade problem

Upgrade log:
---------- HWK Update Client v 2.1.0.0 ----------
---------- HWK upgrade started:6/28/2011 11:38:28 AM ----------
-- Target Id : 62 CF 1 10
-- UFSx Boot : UFxBoot V2.2 (c) SarasSoft 2003.
-- UFSx Firmw.: UFS_USB V2.8 (c) SarasSoft 2007.
-- UFSx ratio : 77350
-- Features : 00000001
-- Licence 5 : True
-- UFSx Vendor: TORNADO
-- HWK ID : A1.04-PRO1-B4530AB100270087
-- HWK Status : 1, DL: 0
----------
Locating HWK Upgrade server...
HWK Upgrade computer found!
Preparing unification to server...
Connecting to HWKUpgrade server...
Server unification successfully established.
Authenticating on server...
Authentication initiate error: Error: Server returned unacknowledged reply

please help me

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