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 v126.96.36.199″ there’s no need to run db2iupdt