When you create a new distribution package, there is an error message popup.
There is a global setting for the Default package location that is using FQDN
Make sure the FQDN can be resolved correctly. Or use the host name/IP address.
1. Open the Distribution packages
2. Click the toolbar 'configure settings' | 'Package settings'
3. Set the default package location to be correct. For example http://coreservername/landesk/files
There are two places on package using the settings. You can use the individual settings on each package.