Deluge is not connecting to daemon on server despite working from another machine

I'm running the Deluge daemon on a server on my home network, and would like to be able to connect with both my desktop and my laptop.

• Laptop: Ubuntu 16.04, Deluge 1.3.12
• Desktop: Ubuntu 14.04, Deluge 1.3.6
• Server: Mythbuntu 14.04, Deluge 1.3.6

Connecting through both deluge-console and the GUI work on the Desktop.

Entering the same information (IP, port, user, and password) on the Laptop does not discover a connection. In the GUI, there is still a grey X in Connection Manager; when attempting to connect through the console, no information is output, the console just remains unconnected. I have disconnected and reconnected the desktop to confirm that all of the daemon information is correct.

I've rolled back the laptop's version of deluge to 1.3.6 to see if there was a version incompatibility, but this didn't fix the problem. Deluged is running as my normal user (not a new deluge user).

I "fixed" this problem by upgrading Deluge on the server to 1.3.12. This can be done with the Deluge PPA Guide here.

Deluge PPA Repository

The ​Deluge PPA contains the latest Deluge releases for Ubuntu.

sudo add-apt-repository ppa:deluge-team/ppa
sudo apt-get update
sudo apt-get install deluge