I have one PDC and two BDC on my network and I have upgraded from NT SP4 to SP6 to clear problems with user passwords - this caused my BDC 1 to loose its server list and will not obtain a new one also the WINs is no longer working so I have to map to drives on the BDC1 using the ip address\sharename - I have tried upgrading to SP60a but its still not working - the PDC is configured to be the Master Browser with backup browser running on both BDC's - BDC2 never had this problem and both are configured the same...help ?