Normally, the client executes a job on receipt of a job execution request from the managing server. However, in an Internet environment, job execution requests from the managing server cannot reach the clients because the internal network is concealed or the NAT facility is used to translate addresses for security purposes. Communication using Internet Options is performed at the following times:

• At periodic polling by a relay manager/system or client
• On execution of the Package Setup Manager at a client
• When a user chooses the Execute Job Backlog icon at a client

Jobs are executed as a result of requests from these lower systems.

HTTP Gateway converts JP1/Software Distribution requests from lower systems to HTTP and sends the request to the specified Internet Gateway. Internet Gateway extracts the JP1/Software Distribution message from the HTTP request and sends it to the higher system. It also converts the response from the higher system into an HTTP response and sends it to the request source. The Web server (Microsoft Internet Information Services) is used for processing HTTP.

The following figure shows the job flow via Internet Options.

Figure E-2 Job flow via Internet Options

Note that job execution requests from the higher system are not received by the lower system. You must therefore set 0 in Max. number of subsystems in which jobs can execute concurrently in the setup for the higher system. Also, because jobs are executed only when there is a request from a lower system, you must set up polling for the lower system.

For details about setting up the higher and lower systems, see E.5(5) Setting up the higher system, and E.6(5) Setting up the lower system.