i have this connection error too (NC450), but only via TP-Link Cloud. No Internet connection available. Please check your network. When i login via DynDNS / Webhost it works fine! Even it works fine...

i dont know how to do it internal (fritzbox), but here its how it looks like on my ports, and what it looks like in browser (firefox).

as i tested this again, yes, this effect is on Mac and Windows! BUT, only via dyndns (webhost), when i login via ip-adress it works fine. so there must be somthing get lost, between ip and dynamic...

Hey, i just try out my home pc (windows 7). > internet explorer its not working / no login > firefox login possible, screen white > chrome login possible, screen white so, exactly the same effects as...

hey there, i just done the new update of the cam, and the controls seem to be much better. i also got the cam started again via DynDNS and acessable via hostname/ip-adress. when i login via ip-adress...

THE SOLUTION: Dont use port 80. Better use 8080. If this not works, because its reserved (like by me). set your Cam to DMZ Zone in active. this worked. anyway, ist bad that you onle have 1 admin...