You have to specify the port in the SAP UI Landscape.
The lookup via the /etc/services file is not used anymore.
If you distribute a SAP UI Landscape i.e. via an web server you can use it as central SAP UI Landscape for all SAP GUI's. Please see the documentation for details on this topic.
FYI: You should use tools like uuidgen to create uuids for the SAP UI Landscape. Otherwise you can run into problems, because the uuid is not a real "universally unique identifier"!
Regards
Robert