I'm using a DNS server to connect to my Dlink camera. On Android, I can add camera manually using external IP and it will take my username and password. I can view it outside of my network. On iPhone, it gives me a credentials error, but only when I add it manually. If I add it through discover, it will take my credentials. However, I can't view the camera outside of my network. Since everything works perfectly on Android, I can safely assume this is an iPhone bug.