Thanks again, i can't change the port 3000 for a webserver because is a webmail service that we use for many years. In the red interface for us, is better to use port 80 and redirect using a rule to that port (3000). I read the post that you suggest, and prove some instructions, but finally when i check from the internet, the port 80 is still closed. I use my Endian box like proxy too. Another idea?

?
Fsendoya