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 …

And for those of you using Joplin CLI as well, disable it there too. :wink: joplin config net.ignoreTlsErrors true

Update: I have implemented a temporary fix on Joplin Cloud which should solve the issue for now. If you're having still some issues please let me know. An updated desktop app will be available later on with a more permanent fix.

I am having issues with Nextcloud sync. I self-host the nextcloud and it shows a valid cert when I check from the web interface.

This worked for Joplin Cloud, and the same method could be applied on your server probably: [Bug]: Let's Encrypt root CA isn't working properly · Issue #31212 · electron/electron · GitHub

The workaround works, but does it present a security issue? Thank you.

No it doesn't, it's still a valid certificate.

Thank you, thank you!!! Invaluable help. I was tearing my hair out with Joplin desktop having the certificate error and I kept thinking it was the cert on my nextcloud.

For those running their own Joplin Server using apache and certbot to manage the certificate generation, the following fixes the issue: sudo certbot certonly --preferred-chain "ISRG Root X1" --apache (Note this is a suggested reply in the link posted above by @laurent ) The joplin server setup I'm…

In case others are having issues with --preferred-chain not being a recognized flag on Ubuntu 18.04 LTS, following this comment worked for me: [Bug]: Let's Encrypt root CA isn't working properly · Issue #31212 · electron/electron · GitHub

Thanks laurent! This fixed my desktop issue on desktop.

Fix for "Certificate has expired" error with Joplin Cloud and self-hosted sync targets

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Fix for "Certificate has expired" error with Joplin Cloud and self-hosted sync targets

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