[Samba] changing file permissions from Windows

I don't know if this is a Windows problem or if I don't have the correct Sa=
mba configuration... each time that I want to change permissions for a shar=
ed file, it asks me to log in with an account which has permissions in my d=
omain !!, no matter if I logged in with the Samba admin account or with a n=
ormal account.
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