@JohnGhost If you think that the router UPnP feature doesn't work as expected in your particular case, you can always configure a port-forwarding (virtual server) and disable UPnP to mitigate this.

@JohnGhost The thing is that the router can't open the same external port to two different internal IP addresses. Actually tha application (your game) tells the router which external port should be...

@Scotsand If you're with the TL-WA1201(EU)_V3_1.10.40 Build 240715 firmware release already, you could use the PoE injector to exclude an issue with the power adapter. If there's no improvement you...

@Scotsand If you use to power the AP a passive PoE injector over a long ethernet cable, try powering up the AP with the power adapter included and check if there's a difference.

@Acl80 Check this thread.

@pioche With this topology there's no other way to do this except running a cable from PC2 to the Switch_1.