samba - Feb 2006 - Browse list propagation

I had some discussion about this problem at the end of January and have 
investigated further. The problem: Clients directly connected to the 
subnets of the Samba server get a browse list (network neigborhood), 
while clients that access the serveer over a router do not. there are no 
broadcasts, Samba is functioning as a WINS server and is working for all 
clients (nblookup proves this). I upgraded from 3.0.10 to 3.0.20b-1 but 
this made no difference.
I have spent quite some time with Ethereal an notice that all clients 
request SRVSVC NetrServerGetInfo request (port 445) and the information 
is false in the response from the Samba server :
This is NOT a potential browser
This is NOT a master browser
This is NOT a domain master browser
although the smb.conf has:
local master = yes
preferred master = yes
domain master = yes
domain logons = yes

The clients in the local subnets also request LANMAN NetServerEnum2 
(Port 139) and receive the correct answer:
This is a potential browser
This is a master browser
This is a domain master browser

All clients are Windows XP Professional. What is curious is that it 
seems to be client driven. Why do the remote machines not ask on port 
139? But also why is the Samba reply seemingly wrong on port 445?

Would appreciate any hints or advice here.

Bob

I am still trying to find out why my WinXP clients don't get a browse 
list except when they are directly connected to a subnet of the Samba 
server.
I now find that Win2000 clients work fine in this respect.
The reason is they request server info over port 139 whether local or in 
a remote subnet and always get a correct answer from Samba. The WinXP 
clients request over 139 locally but only over 445 when they are remote 
(Remote means connected via a router here. I do not know how they know 
whether they are remote or not, but they do.) It would seem that if port 
445 gave the right answers then the XP clients would also function ??
I have now got some bad WINS entries in the Samba server. Can anyone 
tell me how to flush them (editing /var/cache/samba/wins.dat doesn't 
seem to do anything).

Thanks,
Bob