Is it preferable to use different ports for rtmp and rtmpt

I am not sure if you found this post.

http://community.wowza.com/t/-/37

My suggestion would be to try rtmp over port 8080 then rtmpt over port 8080. If you think it is more likely that port 8080 is going to be open then you should also try rtmp streaming over this port as well.

Charlie