Hello Bruno, i've been able to verify the issue you've signalled taking the bare 'ports.lst.example'. It's an ugly bug that makes pmacct not deal very much with comments (the one on the second line, for example) only in the 'ports' file. Just deleting the second line makes it work without complains. The bug, however, was not causing any real functionality issue: in fact the remaining part of the file is loaded and parsed correctly. I've just fixed it, it will appear in next release.
Bruno, thank you very much for your cooperation ! Cheers, Paolo