When to use AMF and when to use RTMP??

Hello can someone explain the difference??

I am using all the defaults for the configurations files (remoting and datamanagement) and my app works perfectly on development mode where everything is on localhost, but when we try it on pre-production it keeps throwing an error saying that it couldn't connect to the RTMP channel. The only thing that changes between these two modes is that on development i access everything on localhost and on pre-production we point to another server.

I am totally clueless why this is happening, i am bit confused why data-management uses RTMP and why remoting uses AMF, so if anyone could explain it to me it would be great.

Thanks