Authentication error for one user - help to debug

Maintenance
1

Hi,
My Mail-in-a-Box Instance has problems with one specific user account. The User cannot login via Exchange Client (“Username/Password wrong”) and CalDAV/CardDAV client. But this user is able to connect to the Services Owncloud, RoundCube and IMAP with his credentials. Other users don’t have any impact.

I tried to change his password, but same behaviour as before. Does anyone can tell me how to debug this?

Thanks in advance,
redflag237

2

You mention ownCloud, which version are you running? Latest is nextcloud and has an updated z-push (the exchange client).

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3

You’re right, it is NextCloud and Z-Push. Status Page shows “✓
Mail-in-a-Box is up to date. You are running version v0.23a.”

4

Can you run this while the user tries to log in:

(cd /var/log && tail -f mail.log z-push/z-push-error.log z-push/z-push.log)
5

Okay found the Error. NextCloud rejects the authentication on CardDav and CalDav.

==> z-push/z-push.log <==
11/07/2017 16:07:52 [22531] [ERROR] [user@domain.de] BackendCardDAV->Logon(): User ‘user@domain.de’ failed to authenticate on ‘https://127.0.0.1:443/carddav/addressbooks/user@domain.de/’:
11/07/2017 16:07:52 [22531] [FATAL] [user@domain.de] Exception: (AuthenticationRequiredException) - Access denied. Username or password incorrect

And this is what NextCloud tells me:
Exception: {“Message”:“HTTP/1.1 401 No ‘Authorization: Basic’ header found. Either the client didn’t send one, or the server is mis-configured”,“Exception”:“Sabre\DAV\Exception\NotAuthenticated”,“Code”:0,“Trace”:"#0 [internal function]: Sabre\DAV\Auth\Plugin->beforeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))\n#1 /usr/local/lib/owncloud/3rdparty/sabre/event/lib/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#2 /usr/local/lib/owncloud/3rdparty/sabre/dav/lib/DAV/Server.php(446): Sabre\Event\EventEmitter->emit(‘beforeMethod’, Array)\n#3 /usr/local/lib/owncloud/3rdparty/sabre/dav/lib/DAV/Server.php(248): Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))\n#4 /usr/local/lib/owncloud/apps/dav/appinfo/v1/caldav.php(88): Sabre\DAV\Server->exec()\n#5 /usr/local/lib/owncloud/remote.php(165): require_once(’/usr/local/lib/…’)\n#6 {main}",“File”:"/usr/local/lib/owncloud/3rdparty/sabre/dav/lib/DAV/Auth/Plugin.php",“Line”:188,“User”:false}

Can anyone help me with this?

6

Does this user have a special client? Very weird though.

On the master branch we have updated to NextCloud 12 and a newer version of z-push. Maybe we’ll get lucky and that fixes it? Otherwise you might need to check with the NextCloud people.

7

No special Client, they are using Android (6.0 / 7.0) Exchange Client. CardDAV and CalDAV Apps are on Android, too. I will ask the NextCloud Poeple if they have an idea. Thanks so far :slight_smile:

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