# Scheduled maintenance of the Cloud infrastructure on 22 September 2025

**URL:** <https://forum.ecmwf.int/t/scheduled-maintenance-of-the-cloud-infrastructure-on-22-september-2025/14173>\
**Category:** Announcements\
**Tags:** cams, cds, c3s, ewds, cems, ads\
**Created:** [17 September 2025 08:51 UTC](https://forum.ecmwf.int/t/scheduled-maintenance-of-the-cloud-infrastructure-on-22-september-2025/14173 "2025-09-17T08:51:00Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Michela](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/898d66/32.png) [@Michela](https://forum.ecmwf.int/u/Michela)\
**Post date:** [17 September 2025 08:51 UTC](https://forum.ecmwf.int/t/scheduled-maintenance-of-the-cloud-infrastructure-on-22-september-2025/14173/1 "2025-09-17T08:51:00Z")

</div>

A scheduled essential maintenance of the Cloud infrastructure is planned on **Monday 22nd September 2025, from 11 UTC for a maximum time of 2 hours (time window subject to change)**.

During this period, access to the following services will be disrupted significantly:

- Atmosphere Data Store ([ADS](https://ads.atmosphere.copernicus.eu/)), Climate Data Store ([CDS](https://cds.climate.copernicus.eu/)) and CEMS Early Warning Data Store ([EWDS](https://ewds.climate.copernicus.eu/))
- [CAMS](https://atmosphere.copernicus.eu/) and [C3S](https://climate.copernicus.eu/) websites
- [ECMWF Forum](https://forum.ecmwf.int/)

We advise users to monitor our [ECMWF Service Status page](https://status.ecmwf.int/) to check the Data Stores status and other ECMWF services.

Access to the affected services will be restored as soon as the maintenance session will have successfully completed.

Should the timing of the session be changed, we will post an update in this tred.

We apologise for the inconvenience this may cause.

ECMWF Support

---

<div class="post-metadata">

**Author:** ![Michela](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/898d66/32.png) [@Michela](https://forum.ecmwf.int/u/Michela)\
**Post date:** [18 September 2025 13:46 UTC](https://forum.ecmwf.int/t/scheduled-maintenance-of-the-cloud-infrastructure-on-22-september-2025/14173/2 "2025-09-18T13:46:31Z")

</div>

> [@Michela](#):
>
> from 11 UTC for a maximum time of 2 hours

The session time window has been extended to **4 hours**.