[Observium] multipoller

hi everyone, i'm testing a configuration distributed, following this publish to do it ( http://blog.best-practice.se/2017/10/scaling-observium-horizontally.html), but i can't do: the pollers can't write into main server. (rrdcached into main server listening on port 42227), the pollers send the info to main server. but main server don't save them. Is correct this? somebody can helpme?