I am trying to access a share. I can see it in
1] sbmclient -L URL
2] sbmtree
3] another unix server (AIX 5.3) and I can access it from there using smbclient

Using the same syntax for smbclient on my up-to-date Ubuntu I get

Domain=[DOMA] OS=[Apple Base Station] Server=[CIFS 4.32]
smb: \> SMBecho failed. Maybe server has closed the connection