I agree with what you say.
I only know for example that with the first Yun I used Motion to see the webcam port 8081 and server uhttpd. While now and I scan the doors with which UHTTPD is working I see the usual ports but the 8081 8080 etc non-existent.
What can it depend on? Is the Motion package that's not good?
Sorry but they are at the earliest experiences.