Sync error with Joplin Cloud and Android App: "Trust anchor for certification path not found"

Support
1

Hello there, Joplin community. This is my first time posting a support request. I hope I'm getting it right.

Background

I have been loving Joplin for a year or so (thanks, Laurent), and have just recently decided to buy a Joplin Cloud subscription, mostly to give something back. My notes were originally created on my Ubuntu laptop. I have only recently installed the Android app.

Desired Behaviour

I am trying to sync both my Ubuntu laptop and my Android tablet with my Joplin Cloud database, so that the notes I have on my laptop can be accessed on the tablet.

Issue

My laptop syncs fine, from what I can tell. The Android tablet, however, returns the following error message from the Joplin server, and fails to download any of my notes:


JoplinServerApi: ""Error: uploadBlob: PUT https://api.joplincloud.com/api/items/root:/.resource/0d27cbf9f2c14e87ba11b1a4d435ab47:/content: Error: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.

I attach the relevant logs below.

Details

I am using Joplin 2.6.8 on Android 7 (Kernel 3.10.84-14953299).

Screenshot_20211229-083026
Screenshot_20211229-0830261536×2048 369 KB

Here is the export of the debugging log:

syncReport-1640763043646.txt (131.7 KB)

Encryption is not enabled on the laptop. On the Android end, "Fail-safe" and "Ignore TLS Certificate" are enabled. The sync configuration check is successful.

Any suggestion of what might be causing the problem? Am I using too old a version of Android?

Cheers, and let me know if I omitted any crucial information.

-- Mu

2

Hmm I think that's the Let's Encrypt issue - Fix for "Certificate has expired" error with Joplin Cloud and self-hosted sync targets

It has been fixed but I think it still affects older platforms, which are missing some certificate. I'm not sure at this point how to fix this, especially if you've already tried to disable ssl checks.

3

(thanks for the quick response)

Ack--I see. So you think that upgrading to a more recent version of Android should fix the issue automatically?

4

I think it may be possible to install updated root certificate on your Android.

5

Thanks Roman for the tip--I'm looking into it. I'll report back with the results.

6

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