Drobo Access, slow via internet and aborting

Hallo, i tried to use DroboAccess to share files to my customers.

but i got from all of them negative feedback.

“The Download is very slot ~150kb/s”
“The Download is aborting”

  • the Drobo is connected to via a Switch (1Gbit/s) to the Router (10Mbit/s Upload)
  • the 5N2 is filled with 4HDD and a mSata
  • ResilioSync is up/down-loading with ~7,5Mbit/s when i stop Resiilio the DroboAcces speed is not increasing.

do i have to change some settings?