Solution : https://service.sap.com/sap/support/notes/481095 (SAP Service marketplace login required)
Key words :
give logon information user, give logon information, ep portal solution, terms notebook, login reason, local machine, expected form, <domain_name>\<user_name>, <user_name>, installation
Related Notes :
| 534332 | Central Note for EP 5.0 SP4 Installation |