Admin links to localhost and not localhost:8080

I’m setting up a home server at http://gadren.no-ip.info , with a blog at http://gadren.no-ip.info/wordpress . The problem I’ve having is that when I click on any of the admin links, they link to localhost and not localhost:8080 (I had to set up the server to redirect port 80 since the ISP blocks it). This means that each time I click the admin links, it won’t connect, and I have to manually change the URL to localhost:8080, which is annoying.

This problem is wordpress-only, since phpmyadmin, for example, will stay in localhost:8080.

How can I set all the links in wordpress to localhost:8080? Or is there a way to make localhost always redirect to localhost:8080?