2542660 - Message Based Alerting does not work in AE

You have configured and activated Classical Message-Based Alerting in Adapter Engine. However, when the error hapens, no alert is triggerd. In default traces (sometimes with increased trace level to "Debug" for locations com.sap.aii.af.service.alert*, com.sap.aii.af.service.alerting*, com.sap.aii.alert*) you can see the following error:

Unable to connect to JMS queue 'JobQueue' after '10' attempts. Giving up.

com.sap.security.api.UMRuntimeException: Group with id GRUP.PRIVATE_DATASOURCE.un:Administrators not found!

• SAP NetWeaver 7.4
• SAP NetWeaver 7.5

Unable to connect to JMS queue, message-based alerting, UME, PISUPER, Process Integration 7.0, PI 7.0, PI 7.01, PI 7.02, Process Integration 7.10, PI 7.10, Process Integration 7.11, PI 7.11, Process Integration 7.30, PI 7.30, Process Integration 7.31, PI 7.31, Process Orchestration 7.4, PI 7.4, PO 7.4, Process Orchestration 7.5, PI 7.5, PO 7.5, XI, AEX , KBA , BC-XI-ALR-MBA , Message Based Alerting , Problem