I have two Windows XP clients accessing the same shared file, user1 has the file open. User2 then opens the same file, receiving no warnings about the file being open by another user. File is modified by user1 and saved and remains open. File then modified by user2 and saved. File closed and opened by user1 who sees only modifications made by user2. user1 (WinXP) open test2.ods smbstatus: Locked files: Pid Uid DenyMode Access R/W Oplock SharePath Name Time -------------------------------------------------------------------------------------------------- 14758 10004 DENY_WRITE 0x2019f RDWR EXCLUSIVE+BATCH /work/samba/bazafirm test2.ods Wed Aug 1 17:50:15 14758 10004 DENY_NONE 0x100001 RDONLY NONE /work/samba/bazafirm . Wed Aug 1 17:49:47 user2 (WinXP) open file: smbstatus: Locked files: Pid Uid DenyMode Access R/W Oplock SharePath Name Time -------------------------------------------------------------------------------------------------- 14787 10002 DENY_WRITE 0x2019f RDWR EXCLUSIVE+BATCH /work/samba/bazafirm test2.ods Wed Aug 1 17:55:38 14787 10002 DENY_NONE 0x100001 RDONLY NONE /work/samba/bazafirm . Wed Aug 1 17:55:12 But when I use option "force user = root" tha file lock works OK!!! user1 open file test3.ods Samba version 3.0.25a Locked files: Pid Uid DenyMode Access R/W Oplock SharePath Name Time -------------------------------------------------------------------------------------------------- 2103 0 DENY_WRITE 0x2019f RDWR EXCLUSIVE+BATCH /work/samba/bazafirm test3.ods Thu Aug 16 05:32:28 user2 open file test3.ods (file is open "read mode") smbstatus: Locked files: Pid Uid DenyMode Access R/W Oplock SharePath Name Time -------------------------------------------------------------------------------------------------- 2103 0 DENY_WRITE 0x2019f RDWR LEVEL_II /work/samba/bazafirm test3.ods Thu Aug 16 05:32:28 Why? This is working only if I set option "force user = root"???