Order upon a claimant’s failure to appear

If a claimant, having been duly served with a summons calling him to appear and maintain or relinquish his claim, does not appear in pursuance of the summons, or having appeared neglects or refuses to comply with any order made after his appearance, the court may make an order declaring him and all persons claiming under him forever barred against the applicant, and persons claiming under him, but the order shall not affect the rights of the claimants as between themselves:
Provided that no order shall be made against the Government under this rule except upon an application by summons served not less than seven days before the return day.