When you install the Oracle Solaris OS, the IPP listening service is automatically enabled on a print server when you add the first print queue. the listening service is also disabled when the last print queue has been removed. The default configuration in Oracle Solaris 10 releases is fairly permissive. If you have security concerns, you might want to modify the default configuration to make it more restrictive. The set of unauthenticated IPP operations that is supported by the service should be limited to operations that are the least destructive.