download - BITS credential problem -

i have service download file using credential domain\user error :
errorcode [-2147023582] 80070522
description [a required privilege not held client.]
errorcontext [remotefileerror]
@ windows server 2003 64 bits
i'm setting credential :

                bc.authenticationscheme = authenticationscheme.negotiate;                 bc.authenticationtarget = authenticationtarget.server; 

the user has full access rights on source , destination folders.
using sharpbits library.

seems missing right of access yet. suggestions?

[edit]
seems there failure in resource access provided bits service.
still investigating.

[edit]
investigating rights use bits.
-with command "sc sdshow bits" output on environment works :

 d:(a;;cclcswrpwpdtlocrrc;;;sy) (a;;ccdclcswrpwpdtlocrsdrcwdwo;;;ba) (a;;cclcswlocrrc;;;au)(a;;cclcswrpwpdtlocrrc;;;pu) s:(au;fa;ccdclcswrpwpdtlocrsdrcwdwo;;;wd)

-where copy not work :

 d:(a;;cclcswrpwpdtlocrrc;;;sy) (a;;ccdclcswrpwpdtlocrsdrcwdwo;;;ba) (a;;cclcswlocrrc;;;iu)(a;;cclcswlocrrc;;;su) (a;;cr;;;au) (a;;cclcswrpwpdtlocrrc;;;pu) s:(au;fa;ccdclcswrpwpdtlocrsdrcwdwo;;;wd)

the solution : added user "nt authority\network" permissions read @ folders in remote hosts.
that's it.