# Registry fails to download with certificate error in 1.10.11

**URL:** <https://discourse.julialang.org/t/registry-fails-to-download-with-certificate-error-in-1-10-11/136390>\
**Category:** General Usage\
**Created:** [March 25, 2026, 5:49pm UTC](https://discourse.julialang.org/t/registry-fails-to-download-with-certificate-error-in-1-10-11/136390 "2026-03-25T17:49:20Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![mbauman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mbauman/32/31082_2.png) [@mbauman](https://discourse.julialang.org/u/mbauman)\
**Post date:** [April 6, 2026, 9:00pm UTC](https://discourse.julialang.org/t/registry-fails-to-download-with-certificate-error-in-1-10-11/136390/5 "2026-04-06T21:00:43Z")

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Have you tried the letsencrypt test pages that @fredrikekre linked to above? Do they work on your system?

> [@Bad cert when accessing the General registry](https://discourse.julialang.org/t/bad-cert-when-accessing-the-general-registry/112738/13):
>
> See [Chains of Trust - Let's Encrypt](https://letsencrypt.org/certificates/) for some more details. In particular they list a couple of test pages where you can verify the theory above. For example, [https://valid-isrgrootx1.letsencrypt.org/](https://valid-isrgrootx1.letsencrypt.org/) present a valid certificate signed by ISRG Root X1 and [https://valid-isrgrootx2.letsencrypt.org/](https://valid-isrgrootx2.letsencrypt.org/) a valid cert signed by ISRG Root X2.

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