On global configuration page are buttons 'Test connection' and 'Check for Compatible Foreman Hosts'. When configured Foreman instance is unreachable due to a network issue, instead of Foreman version, resp. list of compatible nodes, I've got 'Unhandled error in getting version from Foreman'.

It should be a bit more descriptive message there, I guess connection refused was thrown -> msg aka 'Error - connection to Foreman server refused' would be preferred.