Nextcloud calendar sync not working

[fairose]

Hello everyone,

I am trying to set up my calendar on my UT-Fairphone 4 OTA-2 stable. I have a nextcloud calendar running that syncs with no problems with my thunderbird calendar. But I can't get the calendar to show up on ubuntu touch. My phone and the server are both in the same network.

I had a running setup with a different nextcloud server and a Fairphone 2. From that I remember, that I had to use"Genereric CalDAV" instead of "Nextcloud" in the calendar-account settings.

I tried the stup with the following URLs already because I think in the past the URL was the problem:
http://192.168.x.x/remote.php/dav
https://192.168.x.x/remote.php/dav
http://192.168.x.x/remote.php/dav/calendars/"Nextcloud-username"/"Calendar-name"
https://192.168.x.x/remote.php/dav/calendars/"Nextcloud-username"/"Calendar-name"

I always get a notification-popup that says that the sync finished. If I use https the popup apperas nearly instantly. If I use http it takes a few minutes. No appointment is shown in the calendar. The CalDAV-account is listed in the phones settings. In the calendar-app overview of calendars my nextcloud-calendar is not listed.

Does anyone know what I am doing wrong? I remember that it was a lot of work setting up the calendar on the Fairphone 2 but somehow now I can't get it to work at all with the FP4.

Thank you in advance.

[fairose]

Additional info:

With the command account-console list I can find out the id of the currently existing account (28). If I type account-console show 28 into the terminal I get the following text:

account: id 28, enabled, provider: generic-caldav
Global settings:
/usr/bin/account-console:244: DeprecationWarning: Accounts.AccountSettingIter.next is deprecated
(ok, key, value) = iterator.next()
CredentialsId: 28 (<class 'int'>)
auth/mechanism: password (<class 'str'>)
auth/method: password (<class 'str'>)
enabled: True (<class 'bool'>)
host: http://192.168.x.x/remote.php/dav/calendars/"Nextloud-username"/"Calendar-name" (<class 'str'>)
name: "Nextcloud-username"@192.168.x.x/remote.php/dav/calendars/"Nextloud-username"/"Calendar-name" (<class 'str'>)

What does this deprecation warning mean?

[TheBird]

Nextcloud (I have Owncloud) sync is working correctly with my phone and server. When I do account-console show x I get the same "DeprecationWarning". So this will not be your problem.

But I see another difference in the output.

host: https://owncloud.domain-name.eu
name: nextclouduser-name@owncloud.domain-name.eu

So I think you should only give the base url when you add the nextcloud account in accounts. Could this be your problem?

Oh, and I choose Owncloud, not generic. So that could be why these lines are different.

[fairose]

@TheBird Thank you for your answer. Good to know that the deprecation warning does not matter.

If I type http://192.168.x.x in my browser I get "Error: net::ERR_CONNECTION_REFUSED". https://192.168.x.x leads me to the nextcloud login page. So I think 192.168.x.x is my "base url". I now tried ownCloud, Nextcloud and Generic CalDAV with http://192.168.x.x and https://192.168.x.x. If I choose ownCloud or Nextcloud I get an error saying that the host-URL is invalid and I can't create the account at all. With Generic CalDAV I can create the account but the calender does not sync.

I synced my new phone with my old nextcloud server. I noticed that my old nextcloud server is reachable through http and https while my new one is only reachable via https. I am only in my local network so https is not that important. Are there any known issues with CalDAV and https on UT?

[arubislander]

@fairose said in Nextcloud calendar sync not working:

Are there any known issues with CalDAV and https on UT?

Not specifically. But it is know that UT does not trust self signed certificates.

[fairose]

@arubislander That my be the problem.

Is there a way to trust a certificate in UT? I found ths 4 years old thread:
https://forums.ubports.com/post/16216
Is there a better way of trusting a certificate by now? Or could I use a trusted certificate on my local server?

@zlamalp Did you have any trouble with your method of trusting the certificate of your nextcloud server?

[fairose]

I tryed using this way, DO NOT TRY YOURSELF, I MAY HAVE DAMAGED MY INSTALLATION:

# make the root file system writable
sudo mount -o remount,rw /
# copy certificate
cp /home/.../nextcloud.pem /usr/share/ca-certificates
# run this command
dpkg-reconfigure ca-certificates

I tinkered around a little bit and moved the certificate between /usr/share/ca-certificates and /usr/share/ca-certificates/mozilla. I also renamed it "nextcloud.pem", "cert.pem" or "nextcloud.crt".

After the dpkg-reconfigure ca-certificates there is a question shown if I want to trust the new certificates. The answer-options are "yes", "no" and "ask". I ran the command multiple times. Sometimes I choose "yes", sometimes "ask". The next page shows a list with all the certificates. Unfortunatly the screen is croped and I can't read all the text. But I can select my new certificate.

I tryed navigating to https://192.168.x.x:1234 (my nextcloud instance) in the morph-browser to check if there is a warning about an untrusted certificate. Unfortunatly there still is. And additionally sudo dpkg-reconfigure ca-certificates now shows the error message /usr/sbin/dpkg-reconfigure: ca-certificates is broken or not fully installed and exits after the error.

I am not sure where I went wrong with my tinkering. Any Ideas of how to repair the damage in the sudo dpkg-reconfigure ca-certificates?

[zlamalp]

Hi @fairose,

I still use the way mentioned in my post from almost 5 years ago. It gets overwritten from time to time, but I just re-run the commands to trust my cert again.

I think I changed .pem to .crt, but otherwise it is in /usr/share/ca-certificates/certificate.crt (filename doesn't really matter).

I don't know why are you getting the error, but I guess there is a problem with some certificate you put in there.