Why does Kickstart installation of Red Hat Enterprise Linux 6.7 fail with error "[Errno 14] PYCURL ERROR 31 - "Couldn't use REST"" ?

Issue

• The kickstart installation stops at package downloading as follows.

14:44:00,717 DEBUG   : installpackages is a direct step
14:44:00,717 INFO    : Preparing to install packages
14:44:00,724 WARNING : Try 1/10 for ftp://test:redhat@192.168.0.254/Packages/iputils-20071127-20.el6.s390x.rpm failed: [Errno 14] PYCURL ERROR 31 - "Couldn't use REST"
14:44:00,974 WARNING : Failed to get ftp://test:redhat@192.168.0.254/Packages/iputils-20071127-20.el6.s390x.rpm from mirror 1/1, or downloaded file is corrupt
14:44:00,975 WARNING : package download failure, retrying automatically
14:44:04,228 WARNING : Try 1/10 for ftp://test:redhat@192.168.0.254/Packages/iputils-20071127-20.el6.s390x.rpm failed: [Errno 14] PYCURL ERROR 31 - "Couldn't use REST"
14:44:04,478 WARNING : Failed to get ftp://test:redhat@192.168.0.254/Packages/iputils-20071127-20.el6.s390x.rpm from mirror 1/1, or downloaded file is corrupt
14:44:04,479 WARNING : package download failure, retrying automatically
14:44:10,758 WARNING : Try 1/10 for ftp://test:redhat@192.168.0.254/Packages/iputils-20071127-20.el6.s390x.rpm failed: [Errno 14] PYCURL ERROR 31 - "Couldn't use REST"
14:44:11,008 WARNING : Failed to get ftp://test:redhat@192.168.0.254/Packages/iputils-20071127-20.el6.s390x.rpm from mirror 1/1, or downloaded file is corrupt