My Oracle Support Banner client kerberos connections failing after db upgrade to 18c (Doc ID 2782039.1)

Last updated on APRIL 17, 2023

Applies to:

Advanced Networking Option - Version and later
Information in this document applies to any platform.


After upgrading the database to 18c( (31730250)) kerberos connections with sqlplus client to the database that previously worked ok are now failing with error ORA-28547.



Database alert log shows error ORA-609

Database sqlnet.log shows :-
Fatal NI connect error 12631, connecting to:
TNS for Linux: Version - Production
Oracle Bequeath NT Protocol Adapter for Linux: Version - Production
TCP/IP NT Protocol Adapter for Linux: Version - Production
Time: 19-MAY-2021 17:00:52
Tracing not turned on.
Tns error struct:
ns main err code: 12631
TNS-12631: Username retrieval failed

Client trace shows :-
(9172) [17-MAY-2021 16:31:30:309] nsprecv: reading from transport...
(9172) [17-MAY-2021 16:31:30:309] nttrd: entry
(9172) [17-MAY-2021 16:31:30:309] ntt2err: entry
(9172) [17-MAY-2021 16:31:30:309] ntt2err: soc 764 error - operation=5, ntresnt[0]=530, ntresnt[1]=53, ntresnt[2]=0
(9172) [17-MAY-2021 16:31:30:309] ntt2err: exit
(9172) [17-MAY-2021 16:31:30:309] nttrd: exit
(9172) [17-MAY-2021 16:31:30:309] nsprecv: error exit
(9172) [17-MAY-2021 16:31:30:309] nserror: entry
(9172) [17-MAY-2021 16:31:30:309] nserror: nsres: id=0, op=68, ns=12570, ns2=12560; nt[0]=530, nt[1]=53, nt[2]=0; ora[0]=0, ora[1]=0, ora[2]=0


 Database upgrade


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