samba - May 2002 - Error from Network Neighborhood: \\SMBSERVER is not accessible

I got an error by clicking on the Samba server in the Network Neighborhood:
 
ERROR:
\\SMBSERVER is not accessible, the computer or sharename could not be found,
make sure you typed it correctly, and try again.
 
This is my smb.conf:
[global]
   workgroup = WORKGROUPNAME
   security = share
 
[tmp]
   path = /tmp
 
I can access other servers within WORKGROUPNAME, but they can only see me,
can't gain access to my resource. I'm using Samba 2.2.3a + Debian
GNU/Linux 2.2r5.
 
Please help, thanks a lot.