@Kennyx Your switch is either hardware defective or software bricked.. try tftp recovery and if that fails you need to rma it.

Is there a network loop ? does it work with no devices plugged? unplug everything and plug back slowly one by one. Find the culprit, fix the root cause of the loop.. enable loop detection.

Recent Controller updates have added port mirroring feature to the router but only Ethernet ports. SFP cannot be chosen at all.. That's a funny limitation that makes this feature useless to me since...

@JoeSea weird because most of the software inside is open source..I guess it is a license for something else.

@LeoCurrie they posted the eu firmware now. https://www.tp-link.com/en/support/download/eap615-wall/#Firmware If i knew the software update support of this ap will be this bottom low priority I would...

This is almost certainly an MTU problem.. so let's start.. typical case is that you are using PPPoe.. is that the case? reduce the MTU to 1452 and try again. also make sure the firewall "drop...