Can't connect to sql*net, ORA-12638: Credential retrieval failed

after installed oracle9i, I can use sqlplus, but when I try to use sql navigator, I can't connect to sql*net.
I found out the following error message in logfile:
Fatal NI connect error 12638, connecting to:
(DESCRIPTION=
(ADDRESS=
(PROTOCOL=BEQ)
(PROGRAM=oracle)
(ARGV0=oracleoms)
(ARGS='(DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))'))
(CONNECT_DATA=(SID=oms)(CID=(PROGRAM=c:\oracle\ora92\bin\ORACLE.EXE)(HOST=JZQGG31)(USER=OraUser))))
VERSION INFORMATION:
TNS for 32-bit Windows: Version 9.2.0.1.0 - Production
Oracle Bequeath NT Protocol Adapter for 32-bit Windows: Version 9.2.0.1.0 - Production
Time: 11-MAR-2004 17:04:17
Tracing not turned on.
Tns error struct:
nr err code: 0
ns main err code: 12638
TNS-12638: Credential retrieval failed
ns secondary err code: 0
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
=============================================
Hope somebody can help me! Thanks!

change in sqlnet.ora file
find under oracle home\network\admin\sqlnet
and
SQLNET.AUTHENTICATION_SERVICES = (NTS)
CHANGE TO
SQLNET.AUTHENTICATION_SERVICES = (NONE)
hope it will solve u r problem
kuljeet pal singh

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Installation till basic authentication:
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14. Created a Report Model library with “Report Builder Model” content type.
15. Created a Report library with “Report Builder Report” content type.
16. Uploaded an SMDL to the Report Model library.
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  18. Able to create and save a report using Report Builder.
Hence, basic authentication is working and SSRS is able to connect to Oracle database.
Next we have to configure Kerberos settings between SharePoint and SQL Server.
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In the Report Server machine, opened the file C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\WebServices\Reporting\rsreportserver.config and added the Authentication Types of RSWindowsNegotiate
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b) Account: SharePoint Setup Admin account (spAdmin2)
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                setspn -S HTTP/CER1110.cer.demo.com:9999 CERDEMO\spAdmin2
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c) Account: SQL Server Reporting Service account (sqlRepSrv2)
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4. Logged in as SharePoint Administrator to the SharePoint server and opened the top level site in the IE browser.
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6. Turn on Windows Firewall.
7. While testing the site's data connection using Kerberos settings, got the error
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8. Created a Claims to Windows Token Service account (spC2WTS2).
9. Started the Claims to Windows Token Service.
10. Registered the Claims to Windows Token Service account as a Managed Account.
11. Changed the Claims To Windows Token Service to use the above managed account.
12. Verified that the Claims to Windows Token Service account (spC2WTS2) is automatically added to the WSS_WPG local group on the SharePoint box.
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13. Added the Claims to Windows Token Service account (spC2WTS2) to the Local Admin Group on the machine having the SharePoint App Server.
14. In the SharePoint box, added the Claims to Windows Token Service account (spC2WTS2) in the Act as part of the operating system policy right.
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16. Verified that the Reporting Services account is a managed account and part of the WSS_WPG group.
17. Earlier Service Application Pool - SQL Server Reporting Services App Pool service was associated with the SharePoint Admin account.
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18. Changed the delegation of the Reporting Service account to constrained delegation with Protocol Transitioning. This is because we are transitioning from one authentication scheme (Claims) to another (Windows Token).
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19. Next, the goal was to make the Claims To Windows Token Service account match the Reporting Service account.
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20. Restarted the SharePoint server.
21. Tested the data connection with the Kerberos settings again.
       Got the error
“ORA-12638: Credential retrieval failed”.
Can anyone tell me what is wrong with this setup?

http://www.freeoraclehelp.com/2011/10/kerberos-authentication-for-oracle.html
Problem4: ORA-12638: Credential retrieval failed
Solution: Make sure that SQLNET.KERBEROS5_CC_NAME is set in sqlnet.ora and okinit has been run before attempting to connect to the database.
Do check
http://webcache.googleusercontent.com/search?q=cache:5a2Pf3FH7vkJ:externaltable.blogspot.com/2012/06/kerberos-authentication-and-proxy-users.html+&cd=5&hl=en&ct=clnk&gl=in
If this helped you resolve your issue, please mark it Answered. You can reach me through http://itfreesupport.com/

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