Solution : https://service.sap.com/sap/support/notes/480266 (SAP Service marketplace login required)
Summary : Key words : Related Notes :
When attempting to establish a database connection using privileged modes such as "CONNECT INTERNAL", "CONNECT/AS SYSDBA", or "CONNECT / AS SYSOPER" in SAP environments, users may encounter errors such as ORA-01017, ORA-01031, and others, indicating issues like invalid credentials or insufficient privileges. These connection types rely on operating system group memberships (e.g., UNIX's dba or WINDOWS' ORA_
relevant local groups ora_<sid>_dba, calling operating system user belongs, domain user <domain>\<sid>adm, relevant fix apar iy22458, create audit trail fileora-09817, incorrectly set nls parameters, means ora_<sid>_oper, <sid>adm/sapservice<sid>, slightly restricted sysoper privileges, $oracle_home/rdbms/lib directory
625222 connect with sqlplus takes a long time on Windows 2000 614036 Composite SAP Note: ORA-12631/ORA-12638 602843 Environment settings for R/3/Oracle on UNIX 595874 Failure of domain controller causes Oracle failover 583861 UNIX: Errors due to Oracle executable 562863 FAQ: Logon mechanisms 554112 Important Changes in Oracle9i 445038 Problems when accessing Net8 configuration files 417561 Connect internal in Windows of 2000 domain 403269 AIX: Database can not be started, startsap hangs 175636 cannot startup Oracle (with no/meaningless error(s)) 168243 Assigning sysdba and sysoper authorizations 148535 Database backup fails with RMAN-04005/ORA-01031 97953 UNIX: Relinking of the Oracle executables