From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Barton <lists@wilkesley.net>
Subject: Re: org-caldav: problems connecting to owndrive
Date: Wed, 07 May 2014 15:55:49 +0100
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To: Seb Frank <sebsfrank@gmail.com>, "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>

On 07/05/14 14:43, Seb Frank wrote:

> Testing this with gnutls on the command line confirms the problem:
> % gnutls-cli -V -p 443 my.owndrive.com <http://my.owndrive.com>
> ...
> - Status: The certificate is NOT trusted. The signature in the
> certificate is invalid.
> *** Verifying server certificate failed...
> *** Fatal error: Error in the certificate.
> *** Handshake has failed
> GnuTLS error: Error in the certificate.
>

Just tried this from here and it works OK:

- Status: The certificate is trusted.
- Description: (TLS1.2)-(ECDHE-RSA-SECP256R1)-(ARCFOUR-128)-(SHA1)
- Session ID: 
4C:60:0C:E8:9B:1A:9E:06:07:E6:76:08:74:B3:32:71:5F:9C:90:4F:BB:37:11:D3:B1:29:B4:E4:B5:6E:6C:9E
- Ephemeral EC Diffie-Hellman parameters
  - Using curve: SECP256R1
  - Curve size: 256 bits
- Version: TLS1.2
- Key Exchange: ECDHE-RSA
- Server Signature: RSA-SHA256
- Cipher: ARCFOUR-128
- MAC: SHA1
- Compression: NULL
- Channel binding 'tls-unique': 60fb61844dfc5bf9d2c35875
- Handshake was completed

- Simple Client Mode:

Maybe you need to update your certs list?

Ian.