# Certificate Error since upgrading to 2.4.9 on Windows

**URL:** <https://discourse.joplinapp.org/t/certificate-error-since-upgrading-to-2-4-9-on-windows/20766>\
**Category:** Support\
**Created:** [4 October 2021 22:06 UTC](https://discourse.joplinapp.org/t/certificate-error-since-upgrading-to-2-4-9-on-windows/20766 "2021-10-04T22:06:44Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![dpoulton](https://yyz2.discourse-cdn.com/flex028/user_avatar/discourse.joplinapp.org/dpoulton/32/29723_2.png) [@dpoulton](https://discourse.joplinapp.org/u/dpoulton)\
**Post date:** [4 October 2021 22:53 UTC](https://discourse.joplinapp.org/t/certificate-error-since-upgrading-to-2-4-9-on-windows/20766/2 "2021-10-04T22:53:00Z")

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> [@Fix for "Certificate has expired" error with Joplin Cloud and self-hosted sync targets](https://discourse.joplinapp.org/t/fix-for-certificate-has-expired-error-with-joplin-cloud-and-self-hosted-sync-targets/20638):
>
> Updates: The issue has been resolved in Joplin Cloud, so if you had the "Ignore TLS certificate errors" option enabled, don't forget to switch it off as it is not secure. If you are self hosting and are having troubles with this bug, please give a try to the latest pre-release, which includes a permanent fix: [Pre-release v2.5 is now available (Updated 2 Oct)](https://discourse.joplinapp.org/t/pre-release-v2-5-is-now-available-updated-2-oct/20702) Some of you might be experiencing an error "Certificate has expired" when synchronising with Joplin Cloud (and possibly other ser…

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_[View the full topic](https://discourse.joplinapp.org/t/certificate-error-since-upgrading-to-2-4-9-on-windows/20766)._