Solution : https://service.sap.com/sap/support/notes/153112 (SAP Service marketplace login required)
Key words :
additional key words logon, general logon problems, sap logon control, sap router string, normal sap logon, hostname 'xxx' unkown, load balancing shift, assigned application server, sap router, hostname 'xxx'
Related Notes :
| 308929 | Activating trace for SAP Logon Control |
| 30289 | SAProuter documentation |