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Sync errors with both Dropbox and OneDrive (self signed certificate)

With a new install of Joplin on MacOS (Mojave 10.14.4), I continually get sync errors and sync never completes. The same issue exists with both Dropbox and OneDrive with the same error message:

failed, reason: self signed certificate in certificate chain

Any suggestions?

Can you provide more context for the log (the lines before and after the one you’ve posted)?

Sure, here’s what I’m seeing:


created remote items: 1.
Completed: 01/05/2019 09:30
Last error: FetchError: request to https://content.dropboxapi.com/2/files/upload failed, reason: self signed certificate in certificate chain

OneDrive - this is after I have successfully signed in to my Office365 account via Joplin:

Could not login to OneDrive. Please try again.
request to https://login.microsoftonline.com/common/oauth2/v2.0/token failed, reason: self signed certificate in certificate chain

There is another very long URL after the OneDrive error above, but since I’m new to this forum it’ll only let me add 2 links to a post.

You should use codeblocks to post log or any data that is code. In that case links are not counted as links either. I’ll change your post and you can see what I mean.

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When I come to think of it. How can there be a self-signed cert in the chain when you connect to a valid TLS cert?
Are you using some sort of a proxy, or trying to use mitm-proxy or Charles Proxy? Something doesn’t smell right here.

Seems that this is yet another case where self-signed certificates are causing issues. Fortunately, the desktop app allows this to be resolved by providing a choice to avoid TLS errors as well as a choice of where the app should reference the certs. Unfortunately, the same can’t be said of the Android app…

Android client: Network connection error

If you connect to Google or Dropbox where is there a self-signed certificate? Also, did you see that the OP was talking about the desktop version?

Good to know. Thank you :slight_smile:

No proxy. I’ll try from my home network later tonight to see if I get a different result.

I tried again on my home network, and confirmed that I’m getting the same errors with both Dropbox and OneDrive.

In the config screen, in your Nextcloud or WebDAV settings, do you have something set for “Custom TLS certificates”?

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No, the Nextcloud and WebDAV settings were blank.
But, in WebDAV, I enabled “Ignore TLS certificate errors”, and then changed the target back to Dropbox. And that worked - it’s syncing properly now.

I’d suggest moving that “Ignore TLS…” option outside of the targets, since it’s currently only visible under WebDAV and Nextcloud.

Anyway, that was a huge help - thank you! :smiley:

This is quite strange though. If it’s not a bug in Joplin then there’s something not right with your internet connection. If someone was MITM your connection, it would give this kind of error, but even if it’s not malicious there’s something weird going on, so you probably should try to find the root of the problem.

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I agree. For me this looks like a a MITM attack.

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This is all happening on a work-issued laptop that has some anti-virus network software running. So maybe that is causing this to act like a MITM issue, since it happens on both my home and office networks.
I’ll try installing Joplin on another machine and see if it behaves the same way on both networks.