This bug appears always when the samba cannot find the other host (with samba 
also) through broadcast queries and must to resolve this adress through WINS.

It's normal? From this bug depend other bug - 298 (cannot find DMB from LMB in 
other networks)

Full description:
-----------------

HOST1(192.168.4.1 (WINS)---|ROUTER|---HOST2(192.168.2.1)

[root@host1 root]# ping 192.168.2.1
...
64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=0.494 ms
...

[root@host2 root]# ping 192.168.4.1
...
64 bytes from 192.168.4.1: icmp_seq=1 ttl=64 time=0.506 ms
...

[root@host1 root]# nmblookup -S HOST1
...
querying HOST1 on 192.168.4.255
Got a positive name query response from 192.168.4.1 ( 192.168.4.1 )
192.168.4.1 HOST1<00>
Looking up status of 192.168.4.1
        HOST1         <00> -         H <ACTIVE>
...


[root@host1 root]# nmblookup -S HOST2
..
name_query failed to find name HOST2


BUT WINS work correctly:
[root@host1 root]# smbclient -L HOST2
...
Got a positive name query response from 127.0.0.1 ( 192.168.2.1 )
error connecting to 192.168.2.1:445 (Connection refused)
Password:
...


And from other host:
[root@host2 root]# smbclient -L HOST1
...
Got a positive name query response from 192.168.4.1 ( 192.168.4.1 )
Password:
...

Config of HOST1:
----------------
[global]  
netbios name = HOST1
wins support = Yes
...

Config of HOST2:
----------------
[global]
netbios name = HOST2
wins server = 192.168.4.1
...