Basic Authentication has no effect on handler files

Hi,

One of my friends has an application on my server and he asked me to create basic authentication for his application. The basic authentication works for the root of the application and all files/folders except the .ashx handlers. When I call default.aspx or any other file I get the user name and password prompt, but no prompt for .ashx files. Is there way to fix it?

 
Thanks in advance

telmessos