I have FC3 with samba 3.0.10-1. I've followed guidelines about Domain Menbership of The Official Samba-3 HOWTO and Reference Guide. All seems work fine. Win2K3 users log in my FC3, getent passwd and groups show all it must, testjoin is ok, "wbinfo -a user%password" reports : plaintext password authentication succeeded - challenge/response password authentication succeeded, ... When I browse network resouces from a win client all is Ok, but when browsing from FC3 i get a username/password prompt for a resouce shared byf Win2K3 and also for a resource shared by FC3. Giving username and password I can work with shared resource ( but user is the same logged!). Testing with "smbclient -k -L host" reports : spnego_gen_negTokenTarg failed: No credentials cache found session setup failed: NT_STATUS_OK Someone can help me ? Sorry for my English!