Zend certified PHP/Magento developer

High upload activity in office network

We have 5 sub-offices each with Native-internet wifi network (only country-inside and office related sites) , each run 10 – 20 PCs (Clients). The problem is some of the offices show high UPLOAD activity (equal or more than download usage) without any notable misuse by employees, EVEN IN DAYS OFFICE IS CLOSED.

  • Because of the banned non-native sites by interanet , auto updating Windows or Softwares is not the problem.
  • WiFi is limited to office devices by filtering MAC addresses.
  • Some employees don’t turn off their PC after going off the work. anyway , all windows logged out after one hour.
  • We limited upload speed of almost all of the PCs to 7kb/s. still no luck.

any ideas?

Thanks.