Friends Cant join Bukkit Server with No-IP

So I'v created a bukkit server before with no-ip. but for some reason on the new server i made it friends cant join, but im able to join with localhost. i downloaded the DUC program and that is running and connected properly. I port forwarded correctly. the port is open i checked with canyouseeme.org. i allowed port 25565 through my firewall also. Iv searched the forums and cant find a solution any help?

I'v been working on this for a few days now. My buddies really want to play. Could someone please help out?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

I'd have to see exactly what you did, and unless you can give me a video of your memory, I can only guess.
Make sure you have selected A on no-ip and not something like round-robin
Double-check EVERYTHING
Put your computer in the DMZ (this needs to be done in the router)

 

A is selected on no-ip and DMZ was disabled, and i enabled it.
My friends are able to join Thanks so much!