Discovery of AS400 devicesIssue By default, ServiceNow cannot discover AS400 devices.ReleaseAll releasesResolutionThe following community article provides a method to discover AS400 devices if your system administrator allows it. Adding AS400 to Discovery Note: The community workaround is not supported by ServiceNow as it is considered a customization. To suggest a future enhancement, submit an idea in the Idea Portal. ServiceNow product managers review these requests during each release cycle. For Service Mapping, an AS400 device must first undergo successful horizontal discovery before you can attempt vertical discovery (Service Mapping).