Can't configure DAVDroid account with Synology

  • Hi,

    So, first of all, thanks for the app. Though, for now, I do not have the pleasure of using it, I appreciate the work.

    So, my problem is the next : I can't seem to be able to correctly connect to my CALDav server with DAVDroid.

    My CalDav server is a Synology, and WebDav/CalDav is correctly activated, according to DSM.
    I recently bought a domain name and a proper certificate (gandi) for my synology.

    So, I had to create a calendar with my syno, located on the web repertory.

    When I use the direct adress of my NAS (meaning, just the domain and the port, not the repertory), i get this : "missing capabilities invalide dav response : couldnt determine principal path (rfc 5397)".
    Otherwise (with the path to the calendar) , I get this : missing capabilities invalide dav response neither caldav nor carddav available...

    So, I tried to look for some explanations, but I didnt find any, which is why I come to you for help.

    Best regards,

  • developer

    We couldn't test DAVdroid with Synology successfully yet. Can you please provide a test account that is working with other clients and send it to

  • Hi,
    I've got the same error:

    Missing capabilities: Invalid DAV response: Couldn't determine principle path (RFC 5397)

    It's not with Synology but with Baikal on my webhoster.
    It works with http, but fails when using https.
    If you want to try, I made a test account. Due to issues with apache PHP via CGI, only basic authentication works:

    http url:
    For correct certificate use for https:
    https url:
    username: test
    password: test
    Enable preemptive authentication

  • I don't have a lot of time, but I will first have to run some test on other clients. It's an account with access to WebDav/CalDav on my Syno you need, right ? If so, no problem. I'll do my test, and then, I'll send it to you.

  • Hi,
    Any help is welcome, but don't feel rushed by me. I'm using your issue to add information about mine.

    I was checking whether my issue was already posted before writing a new one. Yours seemed similar due to the error message.
    Since rfc2822 was asking for more information and a test account, I thought it might be helpfull to make one for my issue as well.
    Maybe our issues are related and my test account can help solving them.

  • Hi,

    Little update 🙂
    Sorry, it's a bit late, but I didn't had time to do it before.

    I ran some test, and it's working fine on Thunderbird (with Lightning), but I still got the same error with DavDroid.

  • developer

    After testing a Synology device, I found out that for some reason, the current-user-principal is not returned, so that auto-detection of resources is not possible (and DAVdroid only supports resources which are automatically detectable).

    > PROPFIND /CalDav/Testuser/ HTTP/1.1
    > Authorization: Basic XXXXXX
    > User-Agent: curl/7.32.0
    > Host: xxxxxxx:5006
    > Accept: */*
    > Depth: 0
    > Content-Length: 73
    > Content-Type: application/x-www-form-urlencoded
    * upload completely sent off: 73 out of 73 bytes
    < HTTP/1.1 207 Multi-Status
    < Date: Sat, 29 Mar 2014 21:17:51 GMT
    * Server Apache is not blacklisted
    < Server: Apache
    < Content-Length: 344
    < Content-Type: application/xml; charset="utf-8"
    <?xml version="1.0" encoding="utf-8"?>
    <D:multistatus xmlns:D="DAV:" xmlns:ns0="DAV:">
    <D:response xmlns:lp1="DAV:">
    <D:status>HTTP/1.1 200 OK</D:status>

    I have looked for a way to report/discuss that with Synology, but I couldn't find any way to contact them electronically except the contact form, which I can't use because I actually don't have an own Synology device and can't register without serial number etc.

    Follow up: & waiting for a response…

  • developer

    I have also read that it is possible to install OwnCloud (maybe even other CalDAV/CardDAV servers?) to Synology devices, which would work around this problem.

  • developer

    Also see

    Closing this for now, please report further problems directly to Synology.

  • Any news following this issue ? Did you received any feedback from Synology?
    I'm actually in a similar situation: bought the davdroid app but can't get it working due to this Synology issue.


  • developer

    DAVdroid 0.6.12 now supports Synology, we have changed the detection code so that it doesn't require current-user-principal support.

    Configuration details:

  • Thanks a lot, it will be useful 🙂

    I wish Synology had corrected the bug on their side, though.

  • admin

    @TheDoctorII yes, would have been a lot easier if they did...
    @henry-nicolas Can you maybe test the new version 0.6.12 (see for configuration details) and tell us if it works for you?


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