I have 11 Windows XP Pro workstations and 2 Windows XP Pro laptops in my network, tux is the samba server, dns server and mail server. Samba is configured as PDC with: workgroup = JJH server string = TUX os level = 65 preferred master = yes domain master = yes local master = yes wins support = yes There is no other windows server within the network, although some workstations offer shares and/or printers. Domain logon, roaming profiles, shares etc. everything works just fine. Browsing of shares works nicely. As soon as one laptop (laptopd) comes on-line, I start getting nmb problems. That laptop announces itself as being the master browser, whereupon tux stops supplying browsing information. After a while, tux wins out and is the master browser again. Whilst laptopd is the master browser, not all available shares are being listed, and some non-existing shares are listed, network connections are very slow during this time. I was playing around with OS level (up to os level = 255), no change. I disabled browsing on the laptop (control panel -> Administrative tools -> Computer management -> Computer Browser Properties) from automatic to disabled, also not producing the desired result. Here is an extract of the log.nmb [2005/10/18 16:14:13, 0] nmbd/nmbd_become_lmb.c:become_local_master_stage2 (396) Samba name server TUX is now a local master browser for workgroup JJH on subnet 192.168.1.10 [2005/10/18 16:25:44, 0] nmbd/nmbd_incomingdgrams.c:process_local_master_announce(311) process_local_master_announce: Server LAPTOPD at IP 192.168.1.49 is announcing itself as a local master browser for workgroup JJH and we think we are master. Forcing election. [2005/10/18 16:25:44, 0] nmbd/nmbd_become_lmb.c:unbecome_local_master_success(149) Samba name server TUX has stopped being a local master browser for workgroup JJH on subnet 192.168.1.10 What do I try next? I had a good look on the web and I have addressed the two possible causes (os level and browser on laprop), unfortunately to no avail. I assume that this may be some Windows XP settings on the laptop, because 12 machines behave well, and one throws a spanner into the works. Any clues welcome Peter