# Issue: CDS API with Python breaks when downloading several datasets

**URL:** <https://forum.ecmwf.int/t/issue-cds-api-with-python-breaks-when-downloading-several-datasets/11320>\
**Category:** C3S - Datasets and Usage\
**Tags:** cds, c3s, cerra\
**Created:** [12 February 2025 09:31 UTC](https://forum.ecmwf.int/t/issue-cds-api-with-python-breaks-when-downloading-several-datasets/11320 "2025-02-12T09:31:41Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Joan\_Saladich](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/j/65b543/32.png) [@Joan\_Saladich](https://forum.ecmwf.int/u/Joan_Saladich)\
**Post date:** [12 February 2025 09:31 UTC](https://forum.ecmwf.int/t/issue-cds-api-with-python-breaks-when-downloading-several-datasets/11320/1 "2025-02-12T09:31:41Z")

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hi,

I am trying to download several years of CERRA with hourly observations. The script is use (I can’t share here unfortunately) works the following way:

For every month it downloads a single variable (eg. temperature) netCDF file.

This way I can guarantee files are small enough. The download works, but it always crashes after 20-30 netCDF files with the following traceback:

requests.exceptions.SSLError: HTTPSConnectionPool(host=‘cds.climate.copernicus.eu’, port=443): Max retries exceeded with url: /api/retrieve/v1/jobs/aca98c28-a120-4ddb-91cc-e29567d0c996?log=True&request=True (Caused by SSLError(SSLEOFError(8, ‘[SSL: UNEXPECTED\_EOF\_WHILE\_READING] EOF occurred in violation of protocol (\_ssl.c:1000)’)))

The file the causes this break is generated in the C3S, as i can see by your GUI.

Could you help on this error? It bothers quite a lot to get random crashes

Thanks!