I have set up network shares on three Ubuntu computers in my LAN using system-config-samba. For a while were were able to browse each others network-shared directories, but now it is not working.
How do I go about diagnosing the problem? It would be good to have an easy-to-use GUI.
Navigating in Thunar and clicking one of the computers gives "Failed to retrieve share list from server: Connection refused."
(Answer below.)
Here is smbtree output from one of the machines, showing that it recognizes two others machines.
WORKGROUP
\\APOLLO apollo server (Samba, Ubuntu)
\\ATHENA athena server (Samba, Ubuntu)
\\ATHENA\Canon-MP280-series Canon MP280 series
\\ATHENA\iP1800-series Canon iP1800 series
\\ATHENA\print$ Printer Drivers
\\ATHENA\Shared
\\ATHENA\IPC$ IPC Service (athena server (Samba, Ubuntu))
/etc/samba/smb.conf
[global]
workgroup = WORKGROUP
server string = %h server (Samba, Ubuntu)
dns proxy = no
...
(Answer: I needed to add name resolve order = bcast host after the Workgroup line in /etc/samba/smb.conf)