Hi Maximilian, i encountered this issue before and inquired TP-LINK support also, they said it's known bug, they will release new firmware to solve it, maybe we need to wait for a period of time .. i...

all right!!

what's your network topology? i think it's quite easy, you need to do port forwarding , but without network topology , i don't know how to help you

hello jorgecorazondeleon i have tried this beta from yesterday. Until now everything OK! the router always can't open web interface after several hours before(but i can go to internet at that time!)....

guys i tried this beta firmware, it works! :D further test will be finished after several days....

yes, i think it's none business of WMM, because you can connect to the router, suppose maybe the imessage is a special service which need open some ports on router to support Inquire MAC support...