Even a Debian machine when it’s not nursed by the lov­ing hands of a sys­tem admin­is­tra­tor for a long time could be a source of prob­lems. I found myself upgrad­ing samba from ver­sion 3.0.24 to 3.2.5 all at once, on our main file­server. And sud­denly all the win­dows machines here at school could not access the shares any­more. This prob­lems seems not to be doc­u­mented any­were. So I took a deep breath and start scrolling the huge samba changelog between the old and the new ver­sion. How­ever I was lucky, the prob­lem­atic change hap­pened at ver­sion 3.0.25a. It seems that the default value of the msdsf root option changed from true to false, but Win­dows cached this infor­ma­tion. To solve the prob­lem the solu­tion is the usual: just reboot windows.