So I can't figure out for the life of me how this is working and I figure someone might show me the way. Here is the setup1) 2 domains that say DOMA and DOMB that don't have any trust setup2) I have an account on both domains say DOMA\User1 and DOMB\User1 (named the same w/ different passwords)3) My laptop sits ont he DOMA domainSo the mystery is, somehow I can authenticate to my DOMB\User1 account via my DOMA\User1 account. My credentials pass through in certain .NET applications i.e. reporting services, custom applications and it shows I am logged in as DOMB\User1. It won't work via RDP or anything but just in other .NET apps. Any ideas how this is working?

Hi David Hodge, Thank you for posting in windows server forums, This is wierd! , you mean to say you are able to authenticate to DomB using DomA user credentials ?? , i would like you to give more info are you logging with DomA user credentials on to the client which is a part of DomB ??Solutions Architect

Yes I am not quite sure how it is working. Looking into some of the code it uses System.Net.CredntialCache.DefaultCredentials when trying to log me in.

Hi BB David Hodge, Can you please let me know more about "System.Net.CredntialCache.DefaultCredentials " have you customized winlogon process ? i mean are you trying to run any custom dll's ?

So it pases the defualt credntials to reporting services over on DOMB which works and thinks I am the DOMB\User1 even though my default credntials should probably be my DOMA\User1 account.