2940987 - Messages failing with error "TransportServlet is not ready to process Messages"

When processing some SOAP messages, you can see that the messages are failing with the following error:

Error during soap processing: javax.servlet.ServletException: TransportServlet(Version $Id: //tc/xpi.adapters/NW750EXT_<SP version>_REL/src/_soap_application_web_module/webm/api/com/sap/aii/adapter/soap/web/MessageServlet.java\#1 $) is not ready to process Messages#

When checking the default traces, you can also see the following error:

Error occurs while the EJB Object Factory trying to resolve JNDI reference Reference Class Name:
Type: clientAppName
Content: sap.com/com.sap.aii.af.app
Type: interfaceType
Content: local
Type: local-home
Content: com.sap.aii.af.lib.mp.processor.ModuleProcessorLocalHome
Type: ejb-link
Content: ModuleProcessorBean
Type: jndi-name
Content: ModuleProcessorBean
Type: local
Content: com.sap.aii.af.lib.mp.processor.ModuleProcessorLocal

com.sap.engine.services.ejb3.runtime.impl.refmatcher.EJBResolvingException: The looked up bean sap.com/com.sap.aii.af.app$com.sap.aii.af.ejb.jar$ModuleProcessorBean$com.sap.aii.af.lib.mp.processor.ModuleProcessorLocal is in an application which meanwhile has been stopped.
at com.sap.engine.services.ejb3.runtime.impl.refmatcher.result.SingleResultImpl.add(SingleResultImpl.java:104)
at com.sap.engine.services.ejb3.runtime.impl.refmatcher.BeanMatcher.matchLocalInterfaces(BeanMatcher.java:185)
...

• SAP NetWeaver 7.5

Bean, SOAP, TransportServlet, EJB, Stopped, Module, Module Processor, ModuleProcessor, Processor, Not ready, Application, Service, EJB3, EJB Object, Process Integration 7.5, Process Orchestration 7.5, PI 7.5, PO 7.5, XI, AEX , KBA , BC-XI-CON-AFW , J2EE Adapter Framework , BC-XI-CON-SOP , SOAP Adapter , Problem