do you know how I can recreate a clean configuration file but with the interfaces already set?
The network config is part of the configuration, so there's no way to salvage just that. You can easily hand-copy those details using two policy manager windows, however.
In policy manager, go to File -> New, which will start a new config file.
-You'll need to go to Network -> Configuration, and populate the network info for your network. You can open another copy of policy manager and copy the details.
-You'll need to import the feature key, which you can do by going to Setup -> Feature Key. Click Details on the old policy manager to copy the key, and click import on the new one to paste it in.
-Once you have the network info populated, you can save that config file wherever you like (to the firewall, to your filesystem to use later, etc.)
WatchGuard Customer Support
Ok, thank you James