Today I received this message from D-Link support, unfortunately too late. They had been mute since Jan 9, so I supposed they wouldn´t react any more. Would still be interesting whether this one works now.
2014-01-22 10:15:00 10000668 Berlin, Stockholm, Rome, Bern
120 Unassigned/New 999 Complete
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Sehr geehrter Kunde,
bitte verwenden Sie folgenden Setup Wizard
ftp://ftp.dlink.de/dns/dns-320l/driver_software/DNS-320L_sw_revALL_SetupWizard_Windows_1-0-2-3_all_eu_20130225.zip
Bei diesem wurde das Password Problem behoben.