Just tried the new 2.2.4, and ran into the following problem: The NT client is performing an fopen(file,"r") from the NT NutCracker Library, which obviously sends an NT SID information with the request (the M$-fopen() doesn't, but for various reasons we have to cope with the NutCracker version). The samba server is now first trying to map the SID to a user id, which we can work around, but then for some reason tries to do a chown() on the file which fails, because it is owned by some other user. Why ever a plain `open-for-read' should try to change the ownership of a file is beyond my abilities to grok. If I try the same program on some NT-local file which is owned by the administrator, the fopen() succeeds. It looks like NT ignores the chown() request, or maybe the Samba server is misinterpreting something here? If anybody could give me a hint how to proceed from here, I'd be very grateful. R' (a courtesy CC of any response to this would be nicem though I'll check the archives)