@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 you can't open the same external port to two different internal IP addresses.

@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.