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

One of the user reported SQL 30082, Rc=24 in DB2 LUW V10.1 database.

He was sure that pasword supplied was correct and his password not expired and no failed login counts as well.

DB: DB2 LUW
version: 10.1, 9.7
OS: AIX

Users having special character like ! or @ # $  etc. may face RC=24.

Set the below registry variable to fix the issue.

db2set DB2AUTH=OSAUTHDB

Some interesting resources.

DB2 users receive SQL30082N, although OS authentication is possible.
http://www-01.ibm.com/support/docview.wss?uid=swg21651924

Password Validation Messages in db2diag.log
http://www-01.ibm.com/support/docview.wss?uid=swg21623221