Host Unlimited Dynmap Ip?

I have a Minecraft server at host unlimited on which I wanted the Dynmap plugin, but everything I enter in the browser at the end does not work. In the Dynmap folder, I've actually changed all the files that need to be changed: e.g. I changed 8123 to 3453. But either I'm too stupid to rewrite the files properly or I'm too stupid to get the needed server ip out because they are so strange at Host Unlimited.

If the plugin is started without error eigl. "IP: Port".

If that does not work ask the hoster if the port is ever free.