When you install the 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 some releases of Solaris 9 and Solaris 10 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.
Operations include:
print-job
validate-job
create-job
get-jobs
get-printer-attributes
send-document
cancel-job
get-job-attributes
cups-get-default
cups-get-printers
cups-get-classes
cups-move-job