R1D2 wrote The switch seems to add a default Deny rule at the end of the ACL ruleset much like Cisco switches do. @Mitya, can you confirm this? Yes, in new firmware design it works as white-list as...

@Mike63 Also check your system time, if NTP works properly, so switch knows, when it needs to block.

@mploug TL-SG108 and TL-SG108S is the same switch by hardware, just the color of the shell is different. It was done only for some marketing things, now there is no TL-SG108S even on official...

@MaxVec I would directly contact your local support, if you can reproduce it easily. I am not sure something will be fixed on v3, while tplink has v4 already, but you can try.

@Moses_89 It is broken, so go to service-center. RMA = Return Merchandise Authorization

@Moses_89 What is the model of the switch? Does it support 802.3af/at or Passive PoE?