Was this working before? Check the Security permissions from the ADS server of the Share and reset the "Everyone Group" to grant no access then enter again to give them full access. Try resetting the password from the Users in the ADS server. Also there is a new release of DSS version 1.32 - you have a very old version.
Thanks Todd,
I found there is something wrong with my ADS when upgrading from win2k ADS to win2k3 ADS. It may make this failure happened. When I using this copy of DSS in a new Windows Domain envioument, it works fine.