Before we can open ports for BYOND's pager, we need to figure out what ports BYOND's pager is using. Here is a brief walkthrough on how to do that. Go ahead and open up Dream Seeker.
Click Options in the menu at the top of your screen. In the list that drops down click Preferences.
Click Pager tab at the top of this new window. You should now see the menu shown in the screenshot above. Enter a port number into the Pager Port box. It doesn't really matter what port you choose, but something between 10000 and 16000 would be a good idea. Please enter the port you chose into the box below.
Click the Firewall button near the left hand side of the page.