Image creation is not completed on Dashboard

Issue

• Tried to create protected glance image on Dashboard, but remaining queued state and no further progress on Dashboard after while.
• The image was being created with Protection: Yes so it can not be deleted.

[user@undercloud ~(overcloud_admin)]$ glance image-list
+--------------------------------------+----------------------------------+-------------+------------------+-----------+--------+
| ID                                   | Name                             | Disk Format | Container Format | Size      | Status |
+--------------------------------------+----------------------------------+-------------+------------------+-----------+--------+
| 437a6d90-7c45-4707-ac91-5a8d37646439 | trusty-server-amd64              | qcow2       | bare             |           | queued | 
+--------------------------------------+----------------------------------+-------------+------------------+-----------+--------+

[user@undercloud ~(overcloud_admin)]$ glance image-delete 437a6d90-7c45-4707-ac91-5a8d37646439
403 Forbidden: Image is protected (HTTP 403): Unable to delete image 437a6d90-7c45-4707-ac91-5a8d37646439

• How do I forcibly terminate being created protected glance image with queued status?
• What is the cause of not responding and remaining queued ?