Hi there, I have two domains: Samba3 PDC for domain HFT1 and window 8 AD DC for domain HFT2. Also there is a windows 8 printer server in domain HFT1. Before I upgrade Samba3 PDC to Samba4 AD DC, users in domain HFT2 can print to the printer server in HFT1. But after I upgraded Samba3 to Samba4 AD DC, users in domain HFT2 cannot print to the printer server in HFT1. Users in domain HFT2 get an error pop-up window, which says "There is no user session key for the specified logon session". I am not a windows guy. So is it something to do with domain trust? and S4 doesn't support it yet. How can I fixed this issue? any idea? Can I configure one-way trust to allow users in HFT2 to print to HFT1? Users in both domain have the same login id and password. Thanks, Allen