The SERVER line must be changed: the 'windows_client_hostname' must be replaced by the 'hostname' of the UNIX server which can be obtained by running the command The file above contains a SERVER line with the 'hostname' of the Windows client, followed by the keyword 'ANY' and by an optional 'port' number that defaults to 27000 if omitted.
The DAEMON line also must be changed, because it contains the path to the vendor DAEMON 'rational.exe' which is specific to Windows.