Thanks Phillip Horn for your help I was wondering if I am using digest authentication if I have the others selected. My understanding is if you select all it will use the one that both the sender and receiver can use. The scenarios I have tested is: basic alone --- passed digest alone --- failed integrated alone --- passed client certificate --- failed basic & anything --- passed integrated & anything --- passed digest & client certificate --- failed What also makes me think that when you select more then one it defaults to the working one (being basic or integrated) the prompt looks the same for either basic or integrated. When I just select digest by itself it will give me a drop down arrow, for integrated it will have user/password/domain and will not work for netscape, and for basic it will just be user/password. I want to test all authentications to see if our software can work with it. Has anyone seen digest work by itself? Thanks All Phil