2451235 - Exception: cx_ai_system_fault: SoapFaultCode:5 Authentication failed.

During a transport tools check of a NON ABAP system there is the following error:

security_00.<X>.log of AS Java system shows (path: \usr\sap\<SID>\<instnr>\j2ee\cluster\server<x>\log\system):

[...]
LOGIN.FAILED
User: *
Authentication Stack: BASIC*SSO2*_*_*ws
Authentication Stack Properties:
auth_method = BASIC
Login Module Flag Initialize Login Commit Abort Details
1. com.sap.security.core.server.jaas.EvaluateAssertionTicketLoginModule SUFFICIENT ok exception true Received no SAP Authentication Assertion Ticket.
2. com.sap.security.core.server.jaas.EvaluateTicketLoginModule SUFFICIENT ok false true
3. com.sap.engine.services.security.server.jaas.BasicPasswordLoginModule SUFFICIENT ok exception true Authentication did not succeed.
[...]
Authentication for web service DeployProxy, configuration default using security policy BASIC*SSO2*_*_*ws failed: Cannot authenticate the user.. * SAP Note 880896 for further info).
[...]

• SAP Netweaver release independent.

CTS+, NON-ABAP, PI, XI, Deploy Web Service, CTSDEPLOY, CO_TFLDEPLOY_PROXY_VI_DOCUMENT, SoapFaultCode:5  Authentication failed. For details see log entry logID, in security log. , KBA , BC-CTS-TMS-PLS , TMS for non-ABAP (CTS+) , BC-CTS-TLS-PLS , Transport Tools for non-ABAP (CTS+) , Problem