2680851 - Error executing servrice from web service navigator "Web service returned error"

You are exectuing a service from Web Service Navigator and you are getting the below error in the Web Service Navigator screen :

Web service returned error. Fault Code: "(http://schemas.xmlsoap.org/soap/envelope/)Server" Fault String: "Client protocol has thrown an exception. Protocol name is [SecurityProtocol]. See nested exception for details. Method Info: Component:<Custom_Component> method : <serviceInterface>(requestId)= (null)""

Below errors are seen in the TSHW traces :

Client protocol has thrown an exception. Protocol name is [SecurityProtocol]. See nested exception for details.
[EXCEPTION]
com.sap.engine.services.webservices.espbase.client.bindings.exceptions.TransportBindingException: Client protocol has thrown an exception. Protocol name is [SecurityProtocol]. See nested exception for details.
at com.sap.engine.services.webservices.espbase.client.bindings.impl.SOAPTransportBinding.invokeHandlerRequest(SOAPTransportBinding.java:1163)
...........
...........
Caused by: com.sap.engine.interfaces.webservices.runtime.ProtocolExceptionExt: No logged in user found.
at com.sap.engine.services.wssec.srt.protocols.ConsumerSecurityProtocol.handleRequest(ConsumerSecurityProtocol.java:177)
...........
...........
Caused by: java.lang.IllegalStateException: No logged in user found.
at com.sap.security.core.server.jaas.SAPLogonTicketHelper.createAssertionTicket(SAPLogonTicketHelper.java:496)

• SAP NetWeaver 7.3
• SAP enhancement package 1 for SAP NetWeaver 7.3
• SAP NetWeaver 7.4
• SAP NetWeaver 7.5

java, webdynpro, security, Error while creating assertion ticket on demand, No logged in user found, Assertion ticket could not be retrieved, Client protocol has thrown an exception, com.sap.security.core.server.jaas.SAPLogonTicketHelper.createAssertionTicket, Web service returned error, com.sap.engine.services.webservices.espbase.client.bindings.exceptions.TransportBindingException , KBA , BC-JAS-SEC , Security, User Management , BC-ESI-WS-JAV-RT , Runtime , Problem