You need to close Launch Centre, and then go to File -> Open Favourite -> Manage Favourites...
When you're looking at Open Remote, you'll see an icon next to each server. Servers with a Star auto-show up. Click the star, and it'll go to the bottom of the list. Click done. Then open remote again and that host should no longer be listed.
Thanks to both of you for the responses. Both were helpful.
Very strange way, but this work to delete hosts from the host-list
Open any FM-file in your FileMaker Pro.
Go to Manage External Data Sources
Click Add file...
Click on the Host you like to remove and click Remove
you can delete more then one if you like to