Did you got this error SQL1639N before ?

SQL1639N The database server was unable to perform authentication becausesecurity-related database manager files on the server do not have the requiredoperating system permissions. SQLSTATE=08001

You might get it while doing db2 connect to SAMPLE user db2user.
If so just proceed like this:

# cd /home/db2inst1/sqllib/security
# chown root:root db2chpw
# chown root:root db2ckpw
# chmod u+s db2chpw
# chmod u+s db2ckpw

Although stated in documentation, on version DB2 v11.1.3.3″ there’s no need to run db2iupdt

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