I was able to resolve this issue. Just in case anyone is interested, I HAD to upgrade the PDC FIRST. Then I was able to upgrade the member servers without problems. ********************************************************* I am trying to upgrade our fully functional Samba domain from v3.0.2 to v3.0.7 or v3.0.8. My question is, do I have to upgrade every server in the domain in order for it to work or should I be able to upgrade one server at a time, test it, and move on to the next server? Or should I upgrade the domain controller first, then upgrade the member servers one at a time? I've tried to upgrade one member server to v3.0.7 and then to v3.0.8 and I have the same problem with both versions: I can't even access the server in Windows Explorer. I get this error: " \\<server> is not available. You might not have permission to use this network resource...There are currently no logon servers available to service the logon request. " The Samba log gives these types of errors: [2004/11/09 14:26:42, 2] auth/auth.c:check_ntlm_password(312) check_ntlm_password: Authentication for user FAILED with error NT_STATUS_PIPE_NOT_AVAILABLE [2004/11/09 14:26:45, 2] smbd/server.c:exit_server(571) Closing connections [2004/11/09 14:26:45, 2] auth/auth.c:check_ntlm_password(312) check_ntlm_password: Authentication for user FAILED with error NT_STATUS_NO_LOGON_SERVERS [2004/11/09 14:26:45, 2] smbd/server.c:exit_server(571) Closing connections [2004/11/09 14:26:45, 2] auth/auth.c:check_ntlm_password(312) check_ntlm_password: Authentication for user FAILED with error NT_STATUS_NO_LOGON_SERVERS [2004/11/09 14:26:45, 2] smbd/sesssetup.c:setup_new_vc_session(608) setup_new_vc_session: New VC == 0, if NT4.x compatible we would close all old resources. [2004/11/09 14:26:45, 2] smbd/sesssetup.c:setup_new_vc_session(608) setup_new_vc_session: New VC == 0, if NT4.x compatible we would close all old resources. [2004/11/09 14:26:45, 2] auth/auth.c:check_ntlm_password(312) check_ntlm_password: Authentication for user FAILED with error NT_STATUS_NO_LOGON_SERVERS [2004/11/09 14:26:45, 2] smbd/server.c:exit_server(571) Closing connections Our basic environment consists of one domain made up of: * Nearly 30 Unix/Solaris 8 & 9 servers - all member servers except one which is the domain controller (no backup domain controller) * A handful of Windows NT & 2003 member servers * Windows 98, NT, 2000 & XP workstations configured to access various Samba shares * We also use winbindd * Pertinent Global settings in domain controller server: [global] workgroup = ourwkgrp netbios name = domainsvr username map = /opt/local/samba/user_map/user.map domain logons = Yes preferred master = Yes domain master = Yes wins server = 159.181.33.12 * Pertinent Global settings in member server: [global] workgroup=ourwkgrp netbios name = membersvr security = domain password server = domainsvr domain master = no local master = no wins server = 159.181.33.12 idmap uid = 10000-16000 idmap gid = 18000-24000 winbind trusted domains only = Yes Thank you for any help you can give.