credentials in /etc/my.cnf

MySQL & MariaDB Percona XtraBackup
1

I do have user and password speciefied in /etc/my.cnf

[client]
user=aaa
password=bbb

after upgrading from xtrabackup 2.2 to xtrabackup 2.3 innobackupex fails to authenticate.
It does not read credentials from /etc/my.cnf anymore? Is this a known issue with 2.3?

Regards, Markus