Is your EMU cracked or what? if not get another fresh copy and retry, if it is Downgrade a version or get BCStorm
Find out which port is being used and stop that program, to port forward just google it. (With your brand of router.)
Regarding that you could just change the ports of the emu to something different that isn't being used such as 25565. (That is not used by most programs other than Minecraft servers.)
List of TCP and UDP port numbers - Wikipedia, the free encyclopedia Look for the unassigned ports and try those! :) Hope this works!
Its fixed already, the codes in the config was wrong and I just have to re-code it.
But when I'm opening up the client, It disconnects me always :(