No connection with the switch

i have Ethernet shield on Arduino uno connected on the router
I not understand the reason when i connected Arduino on ethernet port of the router: works fine.
If i connect Arduino on the switch port n.6 : it does’t connect on 8442

. I have this switch : Switch Desktop 10/100Mbit 8 porte, 4 porte PoE TL-SF1008P
Could be the switch is farewalled and blocks the port 8442? This switch is not visible on the LAN and i can’t manage it

I tried also the example of blinkblynk on getting start but not works
Thank you