Hello, Since yesterday, the Windows desktop client app is not able to connect to my nextcloud that has a Let’s Encrypt certificate. The web version using a browser is connecting fine without any error. I renewed the certificate without any issue. Chain looks correct in the browser. The App displa…

Hello @mduller , I am using a Sophos UTM as a reverse Proxy. The issue was an old certificate authority. https://borncity.com/win/2021/09/30/lets-encrypt-zertifikate-rger-mit-windows-sophos-utm-macos-ios-30-9-2021/ I deleted it and it worked. It seems that browsers are able to find the root cert…

Hello, The problem was located on the reverse proxy using the old chain. While browser correctly

Hi @laurent06 , I am experiencing the same issue. Can you elaborate more on the reverse proxy that was the issue in your case? I do not have a reverse proxy but am still experiencing the issue. Also, if the issue were with a reverse proxy, why do browsers work and not complain about the Let’s Encry…

The problem is about one of the Let’s Encrypt certificates that just expired (DST Root CA X3). It is a very impactful issue over many servers. On windows, if this appear at launch, you can open certificate manager and delete the expired certificate, then relaunch your client. How to : Win+X cert…

Thank you @gZen0n , this worked! I remember having to clean up the DST Root CA X3 on my pfSense box but wasn’t aware it was in Windows’ certificate store as well - looks like even Edge doesn’t use the certificate store of Windows (or it tries different available certificate chains and the Nextcloud …

Certificate-Storage on Windows didn’t help for me, the App just reinstalled it. Update & Reboot on the Server helped for me… :wink: [image] Nextcloud App untrusted certificate, OK in browser ℹ️ Support Hello, I’m having the same issue. I moved my reverse proxy on unraid f…