The Arcana Scheduler uses a communications mechanism called "named pipes" for communication between the Schedule Administrator and the Arcana Scheduler service. If the computer on which the Arcana Scheduler service is running is protected by a firewall and you wish to be able to connect to the Arcana Scheduler service using a copy of the Schedule Administrator running on a different computer, the firewall must allow incoming traffic on port 139.

Note that port 139 is often disabled by firewalls because it is also part of Windows File and Printer Sharing.

The port requirements for the Arcana Scheduler are not configurable. Our newer scheduling product, adTempus, uses TCP/IP rather than named pipes for client/server communication, and its port usage can be configured.