[Samba] XP SP3 and posix locking

Adam Williams awilliam at mdah.state.ms.us
Fri Jun 6 19:31:39 GMT 2008

i've had a similar problem for weeks/months now with microsoft word 2003 
saying files are read-only, even when the file permissions are 777.  i 
was google searching which said the problem is due to windows desktop 
search.  i uninstalled that but that didn't completely fix it.  i'll try 
posix locking = no

Dirk Kastens wrote:
> Hi,
> the home directories of our users are NFS-mounted from a NetApp filer 
> to our samba server. Everthing was fine until the users installed the 
> service pack 3 for Windows XP on the client machines. Suddenly it was 
> impossible to write MS Office files on the samba share. Word or Excel 
> documents could only be opened in read-only mode. After de-installing 
> SP3 everything worked well again.
> I found out that setting the samba option "posix locking = No" 
> resolves the problem. The manual page of smb.conf says: "You should 
> never need to disable this parameter." So I think this is only a 
> temporary solution. Microsoft must have changed something regarding 
> the locking mechanism inside the service pack.
> Any ideas?
> Our samba environment:
> Red Hat Enterprise Linux Server release 5.2 (Tikanga)
> Kernel 2.6.18-53.1.4.el5
> Samba 3.0.30
> Regards,
> Dirk Kastens

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