I know this is an older post, but I wanted to let you all know that I had the same issues with it not connecting remotely using port forwarding, but it would connect locally. It turns out that when you set up the app and it asks to use "tcp" or "udp". I naturally used tcp and it worked internally, but wouldn't work remotely until I changed it to "udp". Now all is good. Toni @ Vertical suggested to try it and BAM! Came right up.

"I thought I was wrong once, but I was mistaken"