Scheduled Maintenance for Cesium ion on December 30th, 2022

Hello all,

There will be a scheduled maintenance for Cesium ion on Friday, December 30th, 2022 at 8pm EST (UTC-5). It is expected to last up to 6 hours. We will be using this time to upgrade our cloud infrastructure as part of some exciting improvements we will be announcing next year.

During this time, Cesium ion will be available, but read-only:

  • Most client application will be unaffected. You will be able to stream your 3D Tiles tilesets or premium Cesium assets such as Cesium World Terrain and Bing imagery.
  • Creating/deleting/modifying assets, Stories, teams, tokens, etc… will be unavailable.
  • OAuth-based applications will be unable to login to Cesium ion.
  • New account sign ups will be disabled

While we do not plan for ion to become completely unavailable at any point in the maintenance window, as with any major infrastructure upgrade there is always a possibility for small pockets of downtime.

The Cesium Community has members across the world, and in different work week schedules. To ensure up-time and stability of Cesium ion, and impact the least number of users, we are performing this upgrade during a known period of low traffic.

We will use to keep everyone updated on the status of the maintenance.

If you have any questions or concerns, please reply below.


The Cesium Team

Hello, I’m Hidenori Watanave, a certified developer of Cesium.
Happy New Year!

Since the end of the year (perhaps after the mainteinance), the URL of Cesium Stories has been changed so that embedding in iframe is no longer possible.

Old URL:***
New URL:***

For example:

They are featured in Cesium Blog:

The error message is:

Refused to frame '' because an ancestor violates the following Content Security Policy directive: "frame-ancestors 'self' https://*.[](".

I have 2 requests:

  1. Please redirect Cesium Stories contents from the old URLs to the new URLs.
  2. Please make it embeddable in iframe. The redirect is not possible because it is set to “frame-ancestors ‘self’” as shown in the error message.

Since they are mass media content, please address this as soon as possible.

The bug seems to have been fixed.
Thank you for your quick response!