# Connectivity issues

**URL:** <https://community.cesium.com/t/connectivity-issues/13768>\
**Category:** General\
**Created:** [May 24, 2021, 9:31am UTC](https://community.cesium.com/t/connectivity-issues/13768 "2021-05-24T09:31:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![marc](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/marc/32/3458_2.png) [@marc](https://community.cesium.com/u/marc)\
**Post date:** [May 24, 2021, 9:31am UTC](https://community.cesium.com/t/connectivity-issues/13768/1 "2021-05-24T09:31:05Z")

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Hello,

For the last few weeks we are having repeated connectivity issues. First it was the Cesium JS we were using from [cesiumjs.org](http://cesiumjs.org). This server stopped having a valid certificate and would break our map. We switched to [cesium.com](http://cesium.com), and we plan on having a local copy to avoid connectivity issues with Cesium servers.

Today we are having a 503 (service unavailable) on our assets on Cesium ION.

A query to [https://api.cesium.com/v1/assets/1/endpoint?access\_token={token}](https://api.cesium.com/v1/assets/1/endpoint?access_token=%7Btoken%7D) fails with the 503 message. The JS we can workaround it with a local copy, but the Cesium ION is meant to be a cloud service.

How often can we expect this to happen?

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**Author:** ![lisabos](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/lisabos/32/2849_2.png) [@lisabos](https://community.cesium.com/u/lisabos)\
**Post date:** [May 24, 2021, 8:19pm UTC](https://community.cesium.com/t/connectivity-issues/13768/2 "2021-05-24T20:19:47Z")

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Marc,

I’m sorry you were impacted by these issues.

As you experienced, there was a 10-minute Cesium ion outage today between 5:12AM - 5:22AM EDT (9:12AM - 9:22AM UTC) (see [https://status.cesium.com/](https://status.cesium.com/)). After investigation, the root cause was found to be an AWS hardware failure that resulted in a brief loss of connectivity.

We’re pleased the infrastructure recovered so quickly, but understand it still impacted our users. Coming after your experience with the [cesiumjs.org](http://cesiumjs.org) certificate, I see how this feels like a pattern, but this problem was an isolated incident, and availability issues for Cesium ion are rare. That said, we are always looking for ways to improve.

Regards,  
Lisa