503 service unavailable
When trying to start integration builder, we are getting 503 Servcie not avaialble
A HTTP Response 503 in the Adapter Framework can be caused by the following:
The J2EE server might be overburdened and cannot accept the call. The 'Receive'servlet is not called. You will find further details on the HTTP status code definitions under "http://www.w3.org". Check the accessibility of the server by calling: http://<hostname>:<port>/MessagingSystem/receive/AFW/XI.
The Listener Beans of the affected connection (AFW, Marketplace, BC,see above) were not registered or the log-specific Event Handler was not found.
To debug this go to SAP Notes: 803145