In order to fix this issue you have to change the MTU size for your network card. Do that by following the guide below:

  1. Open System Preferences.
  2. Click the Network icon.
  3. Double click ”Ethernet (built in)” or choose ”Ethernet” from the Show drop-down menu.
  4. Click the ”Ethernet tab”.
  5. Under "Maximum Packet Size (MTU) choose Custom and enter 1400 in the box.
  6. Click "Apply now".