[Satellite6] changing hostname with satellite-change-hostname comand fails

Issue

#satellite-change-hostname -u admin --password 'secret' satellite.jp.test

fails with

Failed 'hammer -u admin --password 'secret' capsule update --id  --url https://satellite.jp.test:9090 --new-name satellite.jp.test 2> /dev/null' with exit code 64

#hammer capsule list
---|-----------------------------|------------------------------------------|--------------------------
ID | 名前                        | URL                                      | 機能
---|-----------------------------|------------------------------------------|--------------------------
1  | redhat satellite.jp.test | https://redhat satellite.jp.test:9090 | Pulp, TFTP, Puppet, Pu...
---|-----------------------------|------------------------------------------|--------------------------
[root@redhat satellite.jp.test~]# satellite-change-hostname -u ****** --password 'secret' redhat satellite.jp.test

Checking hostname validity

Checking overall health of server

Checking credentials
***WARNING*** This script will modify your system. You will need to re-register any foreman clients registered to this system after script completion. Capsules will have to be re-registered and reinstalled. If you are using custom certificates, you will have to run the foreman-installer again with custom certificate options after this script completes. Have you taken the necessary precautions (backups, snapshots, etc...)?
Proceed with changing your hostname? [y/n]
y

Updating default Capsule

Failed 'hammer -u ****** --password 'secret' capsule update --id  --url https://redhat satellite.jp.test:9090 --new-name redhat satellite.jp.test 2> /dev/null' with exit code 64
[root@d-0sgi19-rsd01 ~]# LANG=C hammer -u ****** --password 'secret' capsule update --id 1 --url https://redhat satellite.jp.test:9090 --new-name redhat satellite.jp.test
Could not update the proxy