One of our Duet Enterprise customers where I had a.o. configured the workflow capability, requested my support as workflow tasks where no longer published from SAP workflow backend into SharePoint. I performed cause analysis in the combined SAP + SharePoint landscape, starting with inspecting the logs – SAP backend, SAP NetWeaver Gateway and SharePoint systems. The SAP Gateway log contained a recurring error log “logical port not found for Proxy … routing url …”.
I checked in SIMGH on the Gateway system, and found a valid routing url that referred to ‘LOGICALPORTFORWORKFLOW’; and in SOAMANAGER an active logical port with this name.
But when I tried to ping the /IWTNG/CO_TASKFLOW_WEB_SERVICE consumer proxy, http error 405 was returned. The actual cause of the malfunctioning Workflow publishing from Gateway into SharePoint was the SharePoint service account that Gateway uses to authenticate against the Duet Enterprise webservice /_vti_bin/OBAWorkflowService.asmx on the SharePoint server. It had somehow become corrupted, and lacked the authorization to access the WSDL document of the Duet Enterprise service. After recreating/resetting the new service, account workflow publishing is working fine again.
Note: the logged message ‘No logical port found’ can be misleading; in the ABAP code it is the generic catch of whatever problem is encountered upon trying to propagate SAP task notifications from Gateway to SharePoint.