anything went perfect - flightaware, planefinder and virtualradarserver were showing working mlat.
now i gave flightaware and mutability dump1090 (each on different raspis, fresh install from scratch and latest release) a try.
result - about 10% higher stats BUT ANYTHING MESSED UP:
- mutability dump1090: flightaware shows this error on log:
‘mlat(2777): Beast-format results connection with localhost:30104: [Errno 111] Connection refused’
- vrs shows no mlat anymore for both raspis
- planefinder does no mlat for both raspis
additionally i have to say - installing mutability (latest release) was a pain and i do not understand where this configtool is good for. so much easier and faster to have a simple config file.