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I have DB2 Express-C v10.5 instance configured to authenticate against LDAP. The LDAP sever is going to be shutdown and I should configure the same DB2 instance to use Linux authentication.

I copied users from the LDAP  server to a local Linux host running DB2. Then I did shutdown the LDAP server. After that I changed DB2 authentication settings db2 update dbm cfg using SRVCON_PW_PLUGIN IBMOSauthserver (used to be IBMLDAPauthserver before) and restarted DB2.

Applications access the database with the username db2smth (name changed due to privacy reasons). I can connect to a database with db2 connect to dbname user db2inst1 using '********' but connecting to the same database as db2smth fails:

db2 => connect to dbname user db2smth using '********'

SQL30082N Security processing failed with reason "24" ("USERNAME AND/OR PASSWORD INVALID"). SQLSTATE=08001

su - db2smth and su - db2inst1 works fine which means that Linux authentication works fine.

How can I diagnose what's wrong with the authentication?

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  • Did you restart your Db2 instance after making the change? Are you using a root install (Db2 binaries installed in /opt) or a non-root install (installed in ~db2inst1/sqllib)? Jun 20 at 23:20
  • Yes, I did restart. Binaries are installed in /opt/ibm/db2/V10.5/. Weird thing is that when I connect to the database nothing is printed out into /var/log/auth.log. I'm wondering if it is trying to authenticate (Linux authentication) at all and connecting as db2inst1 succeeds without authentication because it is the instance owner.
    – haba713
    Jun 21 at 9:23
  • "How can I diagnose what's wrong" -- increase DIAGLEVEL and check what appears in the diagnostic log after a failed connect. Did you try to log in to the server (shell) using the db2smth credentials?
    – mustaccio
    Jun 21 at 11:48
  • I can login to server with db2smth credentials. I increased the log level 3→4 and this is what is printed out to db2diag.log on connection failure.
    – haba713
    Jun 22 at 20:00
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    You should add details to your question, please don't leave them in comments. Anyway, there is no indication of authentication failure in the log fragment you provided.
    – mustaccio
    Jun 23 at 12:46
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(Since the question was resurrected, I guess I'll add my 2 cents.)

I would verify, if the username conforms to the DB2 naming rules. Since you used authentication plugin previously, I suspect you could ignore those naming rules. Now that you created the user on the server directly, you need to follow them. Here's the link to the rules:

https://www.ibm.com/docs/en/db2/10.5?topic=rules-general-naming

I would specificaly check this one:

For Linux and UNIX system, characters for user names and group names must be lowercase.

I was bitten by it in the past. From what I remember the error messages don't point out this problem directly. The message could have been the one you are getting.

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a simple answer - user db2smth need the 'connect' privilege -- you can try :

  1. db2 connect to dbname user db2inst1
  2. GRANT CONNECT ON DATABASE TO USER db2smth

See also: How do I grant all privileges to local db2admin with DB2 9.7 on Windows?

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  • "user db2smth need the 'connect' privilege" -- what led you to this conclusion? Apparently, when authenticated against an LDAP server, the user did have that privilege.
    – mustaccio
    Jul 14 at 20:33
  • with db2inst1 (Instance Owner / has all DB privileges) it works fine - this led me to my conclusion Jul 14 at 21:08

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