Express edition and Credential retrieval failed - again

Following a successfull installation of the Express edition, I get the common problems of home page not available and 'credential retrieval failed' when I try to login as the system/sysdba. I have read all the threads I have found and have found no remedies which help. I have also tried the following:
- sqlnet.ora: removing the (NTS) auth. service. This just creates another error message:'Oracle not available'
What more is there to check?
My OS is Windows XP SP3
Re-installation: tried multiple times as local administrator and user with the admin rights - no change.

Well, I am not an expert but, after having installed Oracle XE several times on several platforms, and having experienced some problems, I suspect that you should give a try with WXP SP2 instead of WXP SP3...
Good luck!
Victor

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Kerberos Authentication between Sharepoint 2013 Foundation - SSRS 2012 - Oracle 11g failing with ORA-12638: Credential retrieval failed

I have set up SharePoint 2013 Foundation, SharePoint Reporting Services and SQL Server 2012 in a single server. I then created a Data Connection to Oracle 11g. Upon testing the connection, it throws the error “ORA-12638: Credential retrieval failed”.
Given below are the steps of installation and configuration.
Installation till basic authentication:
The installation has been done in a
single server.
Installed SQL Server 2012 (Developer version).
Selected only the following features:
Database Engine Services
Analysis Services
Reporting Services – SharePoint
Reporting Services Add-in for SharePoint Products
Management Tools – Basic
- Management Tools - Complete
2. Installed SQL Server 2012 SP1.
3. Installed SQL Server 2012 SP2.
  4. Installed SharePoint Foundation 2013.
5. Created web application (without Kerberos; we did not even create the SPNs).
      The application pool has been configured to use Reporting Services account since it is a single server installation. This account has been registered as a managed
account.
6. Created Site Collection.
7. Verified that Reporting Services is not installed.
8. Installed SharePoint Reporting Services from SharePoint 2013 Management Shell.
9. Verified that Reporting Services is installed.
10. Created a new SQL Server Reporting Services Service Application and associated the Web Application to the new SQL server Reporting Services Service Application.
11. Verified that SQL Server Reporting Services Service Application and its proxy have started. Reset IIS.
12. Created a Site.
  13. Created a Data Connection library with “Report Data Source” content type.
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.
  17. Added the top level site to Local Intranet instead of as a Trusted Site in the browser settings.
  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.
Implementation of Kerberos authentication
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
and RSWindowsKerberos.
2. Set up the following SPNs.
               a) SQL Server Database Engine service (sqlDbSrv2):
                setspn -S MSSQLSvc/CER1110:1433 CERDEMO\sqlDbSrv2
                setspn -S MSSQLSvc/CER1110.cer.demo.com:1433 CERDEMO\sqlDbSrv2
             In the Delegation tab of the account, selected "Trust this user for delegation to any service (Kerberos only)".
b) Account: SharePoint Setup Admin account (spAdmin2)
     setspn -S HTTP/CER1110:9999 CERDEMO\spAdmin2
                setspn -S HTTP/CER1110.cer.demo.com:9999 CERDEMO\spAdmin2
                In the Delegation tab of the account, selected "Trust this user for delegation to any  service
(Kerberos only)".
c) Account: SQL Server Reporting Service account (sqlRepSrv2)
                   setspn -S HTTP/CER1110 CERDEMO\sqlRepSrv2
                   setspn -S HTTP/CER1110.cer.demo.com CERDEMO\sqlRepSrv2
                   In the Delegation tab of the account, selected "Trust this user for delegation to any service
(Kerberos only)".
3. Configure the Web Application to use “Negotiate (Kerberos)”.
4. Logged in as SharePoint Administrator to the SharePoint server and opened the top level site in the IE browser.
     The Event Viewer logged the login process for the SharePoint Administration account as
Negotiate and not Kerberos.
5. Implemented Kerberos for Oracle database and client.
     Able to connect to the Oracle database via Kerberos authentication using SQL Plus.
6. Turn on Windows Firewall.
7. While testing the site's data connection using Kerberos settings, got the error
“Can not convert claims identity to windows token. This may be due to user not logging in using windows credentials.”
      Note: The Data Connection for basic authentication still worked.
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.
      Note: The Reporting Services service account is also a part of the WSS_WPG local group.
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.
15. The Claims to Windows Token Service account (spC2WTS2) has the WSS_WPG group configured.
      When the C2WTS service was configured to use the managed account Claims to Windows Token Service account (spC2WTS2) earlier, the spC2WTS2 account was automatically
added to the WSS_WPG local group on the SharePoint box. The WSS_WPG group in turn is configured in c2wtshost.exe.config file.
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.
      Changed this to associate the Reporting Service account with the Service Application Pool - SQL Server Reporting Services App Pool service.
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).
      For this, the delegation has been changed to "Trust this user for delegation to specified services only". Also, selected the sub radio button "Use
any authentication protocol". Selected the Oracle Kerberos service as the service to which this account can present delegated credentials.
      Note: The Reporting Service account already had an HTTP SPN.
19. Next, the goal was to make the Claims To Windows Token Service account match the Reporting Service account.
       For this, we created a fake SPN for the Claims To Windows Token Service account since the delegation tab was missing.
       The delegation has been changed to "Trust this user for delegation to specified services only". Also, selected the sub radio button "Use any
authentication protocol". Selected the Oracle Kerberos service as the service to which this account can present delegated credentials.
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/

Credential retrieval failed

I get Credential retrieval failed when trying to loggin to "run SQL Command" tool:
SQL*Plus: Release 10.2.0.1.0 - Production on Fri Dec 8 16:08:26 2006
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> connect sys/<pwd> as sysdba
ERROR:
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SQL> connect / as sysdba
ERROR:
ORA-12638: Credential retrieval failed
SQL>
Message was edited by:
VS1

You've posted to the wrong forum, this is the Application Express forum.

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)))'))
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Oracle Bequeath NT Protocol Adapter for 32-bit Windows: Version 9.2.0.1.0 - Production
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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
=============================================
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change in sqlnet.ora file
find under oracle home\network\admin\sqlnet
and
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CHANGE TO
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http://daust.blogspot.com/2006/03/where-are-images-of-application.html

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I've been racking my head over this issue for the past two three days. Exasperated, I tried searching in the forums but could not find a specific scenario like this.
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Express edition and Credential retrieval failed - again

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