The Remote System Changed dialog appears when a project is open in the workspace and its APSC cache contains Remote Systems that have different settings to the ones in the existing Remote System tree. In such case, you will be asked to update, discard or create a new set of objects for the cached Remote System settings.
The Remote System Changed dialog provides following three options to resolve the version differences:
You can click the Configure Project Cache Settings link to directly change the Remote System Project Cache preferences, to avoid automatically displaying this dialog in future. For details, see Remote system project cache preferences.