I'm new to this list but we've been using Samba on our Sun Ultra running Solaris (Sunos 5.6) for several months. We have a single x86 NT server and several NT, '95 and '98 workstations on the network. We are running Samba 1.9.18p10 and were running 1.9.18.p4 previously. We are running with no password encryption. The following problem occurred in both versions. The problem we're having is NT workstation specific. What happens is that at some point a user comes to me and says he can no longer log onto the Sun via Network Neighbourhood (i.e. to get at the shared directories etc on the Sun) - no matter how many times we try and enter the correct username and password - we get a username/password error. If I delete NTUSER.DAT from the user's winnt\profiles\'username' directory and replace it with a backup everything works again - until something 'corrupts' NTUSER.DAT again. Also, if I logout of the NT workstation and back in as a different user (e.g. me), I can get to the Sun - so the problem is specific to a particular user - i.e. his/her NTUSER.DAT file. Anyone have any ideas of what is happening? I tried searching the Samba archives but couldn't find anything describing this situation. TIA, George Scolaro georges@cognigine.com Cognigine Corp. (510) 490-5005 x 109 42840 Christy St, Suite 205 (510) 490-5755 (Fax) Fremont, CA, 94538