2447919 - Diagnostic Agent does not connect to SAP Solution Manager with the error: 'record with key "$internal/mode" is missing.'

The Diagnostic Agent does not connect to SAP Solution Manager. In the SMDSystem.log is possible to find this error:

 com.sap.smdagent.plugins.connectors.p4.exceptions.P4ConfigStoreException: Error to access to agent configuration 'global configuration'.; nested exception is: 
    java.io.IOException: File "<disk>:\usr\sap\DAA\SMDA<instance>\SMDAgent\.\temp\smdserver\secstore\TechnicalSecStorec<string_with_number_and_letters>.properties" is invalid: record with key "$internal/mode" is missing.
    at com.sap.smd.agent.plugin.connectors.InitialContextLoader.getGlobalConf(InitialContextLoader.java:242)
    at com.sap.smd.agent.plugin.connectors.InitialContextLoader.getDPCWebserviceURL(InitialContextLoader.java:587)
    at com.sap.smd.agent.plugin.connectors.webservice.WSConnectorFactory.configureDPCClient(WSConnectorFactory.java:101)
    at com.sap.smd.dpc.DPCService.initWSConnection(DPCService.java:73)
    at com.sap.smd.dpc.DPCService.init(DPCService.java:45)

• SAP Solution Manager 7.1
• SAP Solution Manager 7.2

connection, secstore, secstore.properties, cannot connect, logs, connection, $internal, internal, Error to access to agent configuration 'global configuration', error in SMDSystem.log diagnostics agent , KBA , SV-SMG-DIA-SRV-AGT , Agent Framework , Problem