internet explorer 8 - how to handle Windows security dialog -

hi have authentication page authenticates users. our org performed improvements reduce login prompts. when use internet explorer see dialogbox enter username/password. if click esc key can navigate our authentication page. using remote web driver. did try below things. org.openqa.selenium.interactions.actions actions = new org.openqa.selenium.interactions.actions(context.getwebdriver()); actions.sendkeys(keys.escape);

context.getwebdriver().switchto().alert().dismiss()

none worked. "windows security" dialog box stays. can point me how dismiss dialog on internet explorer. shankar kc