There are multiple artists named Access Denied.

The first is a breakbeat DJ and live act from Brest, Belarus.

The second is a dutch electronic music group consisting of Erik Van Vliet and Rene Van Der Weyde

The third is polish metal band from Gdańsk.

There's also a German EBM/synthpop/electro band with this name. Sometimes labeled as Acces_Denied, sometimes without the underscore.
They released tracks on various electronic samplers, some singles, at least one remix-cd and a box. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.