# C3S - Access and Login **URL:** https://forum.ecmwf.int/c/access-and-login/c3s-access-and-login/11.md [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) --- ## [About the C3S - Access and Login category](https://forum.ecmwf.int/t/about-the-c3s-access-and-login-category/17)
**Author:** [@Frank\_Lieber](https://forum.ecmwf.int/u/Frank_Lieber)\ **Replies:** 0
For discussions about access to Copernicus Climate Change Service (C3S) products and services --- ## [401 Unauthorized on reanalysis-era5-pressure-levels since ~Aug 11, 2026 (single-levels unaffected)](https://forum.ecmwf.int/t/401-unauthorized-on-reanalysis-era5-pressure-levels-since-aug-11-2026-single-levels-unaffected/15268)
**Author:** [@Nihal\_TEKIN\_UNLUTURK](https://forum.ecmwf.int/u/Nihal_TEKIN_UNLUTURK)\ **Replies:** 1\ **Last updated:** [21 August 2026 12:48 UTC](https://forum.ecmwf.int/t/401-unauthorized-on-reanalysis-era5-pressure-levels-since-aug-11-2026-single-levels-unaffected/15268 "2026-08-21T12:48:23Z")
Hello, Since ~11 August 2026, every request to reanalysis-era5-pressure-levels fails with: 401 Client Error: Unauthorized Authentication failed operation not allowed Notes: The same API key works fine for reanalys… --- ## [ERA5 HRES Reanalysis data request](https://forum.ecmwf.int/t/era5-hres-reanalysis-data-request/1280)
**Author:** [@Mohammad\_Mohseni\_Are](https://forum.ecmwf.int/u/Mohammad_Mohseni_Are)\ **Replies:** 5\ **Last updated:** [27 July 2026 07:09 UTC](https://forum.ecmwf.int/t/era5-hres-reanalysis-data-request/1280 "2026-07-27T07:09:10Z")
Dear all I am looking for ERA5 HRES Reanalysis data which is mentioned here. https://github.com/dbekaert/RAiDER/blob/dev/docs/WeatherModels.md Which can be downloaded using ECMWF API I was wondering how can i sign… --- ## [Server is TOO Slow](https://forum.ecmwf.int/t/server-is-too-slow/12324)
**Author:** [@Gobinda\_Manna](https://forum.ecmwf.int/u/Gobinda_Manna)\ **Replies:** 3\ **Last updated:** [24 March 2026 11:48 UTC](https://forum.ecmwf.int/t/server-is-too-slow/12324 "2026-03-24T11:48:42Z")
I’m trying to download a dataset from the ERA5 server, but the download speed is extremely slow and taking too much time. When is this issue expected to be resolved? --- ## ["Inf" Values in ERA5 Land hourly dataset](https://forum.ecmwf.int/t/inf-values-in-era5-land-hourly-dataset/14702)
**Author:** [@DINESH\_BHANDARI](https://forum.ecmwf.int/u/DINESH_BHANDARI)\ **Replies:** 0\ **Last updated:** [4 February 2026 04:43 UTC](https://forum.ecmwf.int/t/inf-values-in-era5-land-hourly-dataset/14702 "2026-02-04T04:43:09Z")
I downloaded hourly 2-m air temperature and total precipitation data from ERA5-Land using the API & the default Python script, and subsequently computed monthly mean temperature and cumulative monthly precipitation. For … --- ## [Download CDS ERA5 data using R](https://forum.ecmwf.int/t/download-cds-era5-data-using-r/1365)
**Author:** [@Kevin\_Marsh](https://forum.ecmwf.int/u/Kevin_Marsh)\ **Replies:** 12\ **Last updated:** [14 December 2025 18:38 UTC](https://forum.ecmwf.int/t/download-cds-era5-data-using-r/1365 "2025-12-14T18:38:49Z")
Users can download CDS data using the ecmwfr package in R with “cds” as the "service" although it is not supported by C3S. In the examples below, "KEY" and "UID" are your CDS API key and UID respectively. PLEASE NOTE THA… --- ## [Copernicus/CDS down?](https://forum.ecmwf.int/t/copernicus-cds-down/14491)
**Author:** [@Austin\_Reed](https://forum.ecmwf.int/u/Austin_Reed)\ **Replies:** 1\ **Last updated:** [6 December 2025 19:28 UTC](https://forum.ecmwf.int/t/copernicus-cds-down/14491 "2025-12-06T19:28:11Z")
It seems if I type “era5” into the climate data store I am left with Internal Server error (: 24c36f70-aa98-4668-80d3-e9bee69c4689). Is this an issue on the CDS/copernicus end? --- ## [ERA5 Land Data Download](https://forum.ecmwf.int/t/era5-land-data-download/14129)
**Author:** [@Ashok\_Ghimire](https://forum.ecmwf.int/u/Ashok_Ghimire)\ **Replies:** 5\ **Last updated:** [6 November 2025 11:08 UTC](https://forum.ecmwf.int/t/era5-land-data-download/14129 "2025-11-06T11:08:33Z")
I have been trying to access ERA5 Land datasets and the only way I got was to download each month of each year individually and that takes too much time. I want to download total precipitation, 2-m temperature and snowfa… --- ## [How to download ERA5 dataset?](https://forum.ecmwf.int/t/how-to-download-era5-dataset/13235)
**Author:** [@Wenjie\_Zhao](https://forum.ecmwf.int/u/Wenjie_Zhao)\ **Replies:** 1\ **Last updated:** [28 May 2025 10:12 UTC](https://forum.ecmwf.int/t/how-to-download-era5-dataset/13235 "2025-05-28T10:12:47Z")
I‘m trying to download ERA5 dataset using CDS API. But the downloading speed is very slow. I can not download any files in a long time. And also, I don’t know how to set the download path. How to solve thess problems?TH… --- ## [New CDS-Beta very slow](https://forum.ecmwf.int/t/new-cds-beta-very-slow/5111)
**Author:** [@Kerry\_Emanuel](https://forum.ecmwf.int/u/Kerry_Emanuel)\ **Replies:** 33\ **Last updated:** [28 May 2025 08:48 UTC](https://forum.ecmwf.int/t/new-cds-beta-very-slow/5111 "2025-05-28T08:48:24Z")
I am finding that although the new CDS-Beta works, it has been extraordinarily slow, taking many hours just to download a single variable on a single level. --- ## [Faster access to time-series](https://forum.ecmwf.int/t/faster-access-to-time-series/1829)
**Author:** [@lukas\_lundstroem](https://forum.ecmwf.int/u/lukas_lundstroem)\ **Replies:** 18\ **Last updated:** [30 April 2025 14:00 UTC](https://forum.ecmwf.int/t/faster-access-to-time-series/1829 "2025-04-30T14:00:20Z")
I need to access long (multiple years) time-series from single grid points. This is very slow due to the data being stored in spatial format. It probably quite expensive as well for the CDS platform, as each such request… --- ## [Issue with downloading PanguWeathers's assets](https://forum.ecmwf.int/t/issue-with-downloading-panguweatherss-assets/11834)
**Author:** [@Zoi\_Tzamtzi](https://forum.ecmwf.int/u/Zoi_Tzamtzi)\ **Replies:** 1\ **Last updated:** [26 March 2025 14:35 UTC](https://forum.ecmwf.int/t/issue-with-downloading-panguweatherss-assets/11834 "2025-03-26T14:35:20Z")
I am having trouble downloading the necessary assets for running ai weather forecasting models like PanguWeather. Despite having attained the CDS API key, this is the error I am getting: ecmwfapi.api.APIException: “ecmw… --- ## [Problem connection to CDS](https://forum.ecmwf.int/t/problem-connection-to-cds/11359)
**Author:** [@Etienne\_Terrenoire](https://forum.ecmwf.int/u/Etienne_Terrenoire)\ **Replies:** 3\ **Last updated:** [20 February 2025 16:57 UTC](https://forum.ecmwf.int/t/problem-connection-to-cds/11359 "2025-02-20T16:57:43Z")
Hi, I cannot connect to the CDS and I am not sure why. Here is the error: 2025-02-13 12:51:43,359 INFO \[2024-09-26T00:00:00\] Watch our Forum for Announcements, news and other discussed topics. 2025-02-13 12:51:43,360… --- ## [Issues accessing reanalysis-era5-single-levels](https://forum.ecmwf.int/t/issues-accessing-reanalysis-era5-single-levels/8099)
**Author:** [@Kasim\_Rafiq](https://forum.ecmwf.int/u/Kasim_Rafiq)\ **Replies:** 1\ **Last updated:** [3 December 2024 07:27 UTC](https://forum.ecmwf.int/t/issues-accessing-reanalysis-era5-single-levels/8099 "2024-12-03T07:27:10Z")
Hi all, Since the CDS servers went down, I’ve not been able to access the reanalysis-era5-single-levels dataset via your API. This was previously working perfectly, and so is not a coding or incorrect UID/API issue unle… --- ## [There may be a bug when i request dataset](https://forum.ecmwf.int/t/there-may-be-a-bug-when-i-request-dataset/6006)
**Author:** [@yan\_ying](https://forum.ecmwf.int/u/yan_ying)\ **Replies:** 0\ **Last updated:** [23 September 2024 13:49 UTC](https://forum.ecmwf.int/t/there-may-be-a-bug-when-i-request-dataset/6006 "2024-09-23T13:49:03Z")
It seems that queuing the dataset using the API request code takes much longer than simply clicking the ‘Submit form’ button on the web page --- ## [Do you have historical analysis data on visibility and ice thickness](https://forum.ecmwf.int/t/do-you-have-historical-analysis-data-on-visibility-and-ice-thickness/7091)
**Author:** [@xk\_x](https://forum.ecmwf.int/u/xk_x)\ **Replies:** 0\ **Last updated:** [21 October 2024 03:14 UTC](https://forum.ecmwf.int/t/do-you-have-historical-analysis-data-on-visibility-and-ice-thickness/7091 "2024-10-21T03:14:34Z")
I couldn’t find it in any of the datasets --- ## [ERA5 Forecast Accumulation netCDF Download Error](https://forum.ecmwf.int/t/era5-forecast-accumulation-netcdf-download-error/1187)
**Author:** [@Frederick\_Soster](https://forum.ecmwf.int/u/Frederick_Soster)\ **Replies:** 3\ **Last updated:** [16 October 2024 08:23 UTC](https://forum.ecmwf.int/t/era5-forecast-accumulation-netcdf-download-error/1187 "2024-10-16T08:23:51Z")
Hello all, When I attempt to download ERA5 forecast data from the complete ERA5 archive (e.g. https://apps.ecmwf.int/data-catalogues/era5/?stream=oper&levtype=sfc&expver=1&month=dec&year=1979&type=fc&class=ea) in netCDF… --- ## [Issue with Data Download](https://forum.ecmwf.int/t/issue-with-data-download/6670)
**Author:** [@Diah\_Ayu](https://forum.ecmwf.int/u/Diah_Ayu)\ **Replies:** 3\ **Last updated:** [8 October 2024 13:14 UTC](https://forum.ecmwf.int/t/issue-with-data-download/6670 "2024-10-08T13:14:26Z")
I recently encountered an issue when downloading a dataset from the Copernicus Climate Data Store (CDS). Although I requested data for an entire year with hourly intervals, the downloaded file only contains a single line… --- ## [More than 30 minutes to download less than 50Kb](https://forum.ecmwf.int/t/more-than-30-minutes-to-download-less-than-50kb/4828)
**Author:** [@Daniel\_Rouberth](https://forum.ecmwf.int/u/Daniel_Rouberth)\ **Replies:** 3\ **Last updated:** [3 September 2024 14:31 UTC](https://forum.ecmwf.int/t/more-than-30-minutes-to-download-less-than-50kb/4828 "2024-09-03T14:31:16Z")
I’m downloading some data from ERA5 and it’s taking me so much time, I’d like to know if there’s someone who can explain to me why all this time to download a 45.5Kb data, or if I’m doing anything wrong or that may cause… --- ## [AgERA5 download fail for 14, 15 Aug 2024](https://forum.ecmwf.int/t/agera5-download-fail-for-14-15-aug-2024/4370)
**Author:** [@Nickolai\_Sitnikov](https://forum.ecmwf.int/u/Nickolai_Sitnikov)\ **Replies:** 2\ **Last updated:** [29 August 2024 09:24 UTC](https://forum.ecmwf.int/t/agera5-download-fail-for-14-15-aug-2024/4370 "2024-08-29T09:24:59Z")
Hello, I am failing to download AgERA5 data past 13th of August 2024 through both old and new CDS. Error indicates that the requests do not find any data, though web download form shows 14th and 15th of August 2024 as a… --- ## [UserError: Restricted access to ERA5T. Please, check that that your date selection is valid](https://forum.ecmwf.int/t/usererror-restricted-access-to-era5t-please-check-that-that-your-date-selection-is-valid/1231)
**Author:** [@Johannes\_Schmude](https://forum.ecmwf.int/u/Johannes_Schmude)\ **Replies:** 39\ **Last updated:** [3 July 2024 16:08 UTC](https://forum.ecmwf.int/t/usererror-restricted-access-to-era5t-please-check-that-that-your-date-selection-is-valid/1231 "2024-07-03T16:08:06Z")
Hello, There seems to have been some change in how ERA5T data requests are processed. In short, CDS requests that used to run smoothly now fail with "UserError: Restricted access to ERA5T. Please, check that that your d… --- ## [Issue creating a CDS account](https://forum.ecmwf.int/t/issue-creating-a-cds-account/2762)
**Author:** [@Aileen\_Robert](https://forum.ecmwf.int/u/Aileen_Robert)\ **Replies:** 1\ **Last updated:** [20 May 2024 11:43 UTC](https://forum.ecmwf.int/t/issue-creating-a-cds-account/2762 "2024-05-20T11:43:12Z")
I tried to create an account to download the datasets for FWI, unfortunately I am still waiting for the confirmation email for 3 days now and still have not received any :smiling\_face\_with\_tear:. Please help… --- ## [Unable to download ERA5 data due to time-out](https://forum.ecmwf.int/t/unable-to-download-era5-data-due-to-time-out/2725)
**Author:** [@Ezra\_Eisbrenner](https://forum.ecmwf.int/u/Ezra_Eisbrenner)\ **Replies:** 5\ **Last updated:** [17 May 2024 13:21 UTC](https://forum.ecmwf.int/t/unable-to-download-era5-data-due-to-time-out/2725 "2024-05-17T13:21:34Z")
Hi there, I have issues downloading data via the (python) cdsapi, I end up with time-outs. I have commented on an announcement last week, but I thought I better my chances of a timely answer by reposting this as a new p… --- ## [How to retrieve individual ensemble members of seasonal forecasts?](https://forum.ecmwf.int/t/how-to-retrieve-individual-ensemble-members-of-seasonal-forecasts/1401)
**Author:** [@Felix\_Froehlich](https://forum.ecmwf.int/u/Felix_Froehlich)\ **Replies:** 4\ **Last updated:** [14 May 2024 16:59 UTC](https://forum.ecmwf.int/t/how-to-retrieve-individual-ensemble-members-of-seasonal-forecasts/1401 "2024-05-14T16:59:12Z")
Is it possible to retrieve the individual ensemble members of the forecasts from the ECMWF system for the dataset "Seasonal forecast daily data on single levels"? I only ever receive a single value per startdate, locati… --- ## [March 2024 SEAS5 seasonal forecast data not yet available on CDS](https://forum.ecmwf.int/t/march-2024-seas5-seasonal-forecast-data-not-yet-available-on-cds/2120)
**Author:** [@Mutahar\_Chalmers](https://forum.ecmwf.int/u/Mutahar_Chalmers)\ **Replies:** 1\ **Last updated:** [14 March 2024 10:33 UTC](https://forum.ecmwf.int/t/march-2024-seas5-seasonal-forecast-data-not-yet-available-on-cds/2120 "2024-03-14T10:33:44Z")
SEAS5 data is nominally available on 5th of each month at 12:00 UTC, which was yesterday. Still struggling to access it - is anyone else having this issue? --- ## [Radiative heating rate at model levels](https://forum.ecmwf.int/t/radiative-heating-rate-at-model-levels/1620)
**Author:** [@Kuan-Yun\_Wang](https://forum.ecmwf.int/u/Kuan-Yun_Wang)\ **Replies:** 0\ **Last updated:** [23 January 2024 18:10 UTC](https://forum.ecmwf.int/t/radiative-heating-rate-at-model-levels/1620 "2024-01-23T18:10:48Z")
Hi everyone, I downloaded the 0-step-forecast longwave radiative heating rate (paramID: 235002) at model levels, but found that all the values are 0. Is this normal? I also tried to download the analysis longwave radi… --- ## [How to obtain the era5 data of the specified geometric height ? Are there any papers recommended?](https://forum.ecmwf.int/t/how-to-obtain-the-era5-data-of-the-specified-geometric-height-are-there-any-papers-recommended/1616)
**Author:** [@xin\_chen](https://forum.ecmwf.int/u/xin_chen)\ **Replies:** 0\ **Last updated:** [2 January 2024 14:30 UTC](https://forum.ecmwf.int/t/how-to-obtain-the-era5-data-of-the-specified-geometric-height-are-there-any-papers-recommended/1616 "2024-01-02T14:30:11Z")
Good day I already understand how to calculate geometric altitude through raw ERA5 data. ERA5: compute pressure and geopotential on model levels, geopotential height and geometric height - Copernicus Knowledge Base - EC… --- ## [How to download 10m u/v wind](https://forum.ecmwf.int/t/how-to-download-10m-u-v-wind/1549)
**Author:** [@Xiaodan\_Liu](https://forum.ecmwf.int/u/Xiaodan_Liu)\ **Replies:** 2\ **Last updated:** [2 January 2024 10:30 UTC](https://forum.ecmwf.int/t/how-to-download-10m-u-v-wind/1549 "2024-01-02T10:30:39Z")
I want to download 10m u/v wind from 'reanalysis-era5-complete', and I set the aera,codes are below,it runs with some errors #!/usr/bin/env python import cdsapi c = cdsapi.Client() c.retrieve('reanalysis-era5-comple… --- ## [Can Not Access Data](https://forum.ecmwf.int/t/can-not-access-data/1310)
**Author:** [@Jim\_Munley](https://forum.ecmwf.int/u/Jim_Munley)\ **Replies:** 0\ **Last updated:** [26 December 2023 17:17 UTC](https://forum.ecmwf.int/t/can-not-access-data/1310 "2023-12-26T17:17:37Z")
I get data not available on sites? --- ## [Agrometeorological indicators from 1979 to present derived from reanalysis availability](https://forum.ecmwf.int/t/agrometeorological-indicators-from-1979-to-present-derived-from-reanalysis-availability/798)
**Author:** [@Patryk\_Grzybowski](https://forum.ecmwf.int/u/Patryk_Grzybowski)\ **Replies:** 2\ **Last updated:** [20 December 2023 10:53 UTC](https://forum.ecmwf.int/t/agrometeorological-indicators-from-1979-to-present-derived-from-reanalysis-availability/798 "2023-12-20T10:53:46Z")
For several days 'Agrometeorological indicators from 1979 to present derived from reanalysis' pruduct is not available. There appears message "Product temporally disabled for maintenance purposes. Sorry for the inconveni… [Next page](https://forum.ecmwf.int/c/access-and-login/c3s-access-and-login/11.md?page=1)