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[Solved] Android 6.0.1 didn't have some Root certificates for the corresponding SSL certificate my WebDAV server has.

The solution is to install them manually.

In my case it was a Let's Encrypt certificate that can be downloaded from Let's Encrypt Chains of Trust (find ISRG Root X1 and Let’s Encrypt R3 in .pem format).

Then to go to Settings -> Security -> Encryption and Credentials -> Install from SD card and install both certificates.

If prompted for a name for each certificate: input anything, like LEcert1 and LEcert2.

That's it.

I have WebDAV on Android, joy, oh joy ☺.

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Original problem:
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Hi,

Zotero desktop syncs fine with my DreamHost WebDAV, but I can't get to verify the server with the new Android app version.

It throws this https error: Trust anchor for certification path not found.

Report ID: D1494425249

Any ideas as to what might be the problem?

Thanks :O)

I'm so close, oh so close, to WebDAV on Android...