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

yes sorry I meant to get back to my post. When I tried on my linux machine, the client I was using wasn't updated at the latest version! After the update to the latest version I got the error too!

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Maybe it's true, but it doesn't work for me. I updated the letsencrypt certificate for Nextcloud a few days ago. I have the status

  Start Time: 1633547635
     Timeout: 7200 (sec)
     Verify return code: 0 (ok)
     Extended master secret: no
     Max Early Date: 0

and the desktop client still shows me sync errors

EDIT. the joplin mobile app syncs without any problem

after many attempts on the server it turned out that it is enough to install the new version of joplin 2.5.1
The only question is whether the joplin itself changes something or it was enough to do a reinstall.

It is Electron that was the issue. 2.5 upgraded the framework.