503: Service Unavailable after turning off Two Factor Auth

Server
1

Steps to reproduce

  1. Activate Two Factor Authentication
  2. Upload new files
  3. Turn off Two Factor Authentication
  4. Log out on all devices and log in again
  5. Upload new files from phone

Expected behaviour

Everything should sync normally with owncloud app for windows/mac

Actual behaviour

Sync Error 503: Service Unavailable on every other device (windows/mac) for the newly uploaded files and I should logout and login again. But even after doing this a few times, the error still show up.

Server configuration

Operating system: Ubuntu 16.04.3 LTS

Web server: Apache2

Database: Mysql

PHP version: 7.0.28

ownCloud version: 10.0.7.2

Updated from an older ownCloud or fresh install: Updated from previous version

Where did you install ownCloud from: Ubuntu 16.04 Official PPA

Signing status (ownCloud 9.0 and above):

No Errors have been found

The content of config/config.php:

{
    "system": {
        "instanceid": "ocj0tt174fa1",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "cloud.the-hack.de"
        ],
        "datadirectory": "\/home\/owncloud\/data",
        "overwrite.cli.url": "https:\/\/domain.com",
        "dbtype": "mysql",
        "version": "10.0.7.2",
        "dbname": "owncloud",
        "dbhost": "localhost",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "UTC",
        "installed": true,
        "mail_smtpmode": "php",
        "mail_smtpsecure": "ssl",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "theme": "",
        "maintenance": false,
        "loglevel": 2,
        "trashbin_retention_obligation": "auto",
        "log_rotate_size": 104857600,
        "enable_previews": true,
        "enabledPreviewProviders": [
            "OC\\Preview\\Image",
            "OC\\Preview\\MP3",
            "OC\\Preview\\TXT",
            "OC\\Preview\\MarkDown",
            "OC\\Preview\\PDF",
            "OC\\Preview\\MSOffice2007"
        ],
        "forcessl": true,
        "htaccess.RewriteBase": "\/",
        "updatechecker": false,
        "singleuser": false
    }
}

List of activated apps:

Enabled:
  - activity: 2.3.6
  - announcementcenter: 1.2.0
  - audioplayer: 2.2.4
  - calendar: 1.5.7
  - comments: 0.3.0
  - configreport: 0.1.1
  - contacts: 1.5.4
  - dav: 0.3.2
  - diagnostics: 0.1.2
  - encryption: 1.3.1
  - federatedfilesharing: 0.3.1
  - federation: 0.1.0
  - files: 1.5.1
  - files_external: 0.7.1
  - files_external_dropbox: 1.0.1
  - files_pdfviewer: 0.8.2
  - files_sharing: 0.10.1
  - files_texteditor: 2.2.1
  - files_trashbin: 0.9.1
  - files_versions: 1.3.0
  - files_videoplayer: 0.9.8
  - firstrunwizard: 1.1
  - gallery: 16.0.2
  - market: 0.2.3
  - music: 0.5.6
  - notifications: 0.3.2
  - oauth2: 0.2.1
  - provisioning_api: 0.5.0
  - systemtags: 0.3.0
  - templateeditor: 0.2
  - updatenotification: 0.2.1
Disabled:
  - external
  - theme-example
  - twofactor_totp
  - user_external

Are you using external storage, if yes which one: no

Are you using encryption: yes

Are you using an external user-backend, if yes which one: no

Client configuration

Browser: Safari

Operating system: MacOS

Logs

Web server error log

No Error

ownCloud log (data/owncloud.log)

{"reqId":"a92179ac-9bbb-43e7-ab21-4e3730e5b430","level":4,"time":"2018-03-31T17:48:03+00:00","remoteAddr":"******","user":"*****","app":"webdav","method":"GET","url":"\/remote.php\/dav\/files\/******\/InstantUpload\/Photo-2018-03-27-19-35-59_5561.HEIC","message":"Exception: {\"Message\":\"HTTP\\\/1.1 503 Encryption not ready: Private Key missing for user: please try to log-out and log-in again\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\ServiceUnavailable\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(85): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\File->get()\\n#1 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpGet(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:GET', Array)\\n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#5 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Server.php(263): Sabre\\\\DAV\\\\Server->exec()\\n#6 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(31): OCA\\\\DAV\\\\Server->exec()\\n#7 \\\/var\\\/www\\\/owncloud\\\/remote.php(165): require_once('\\\/var\\\/www\\\/ownclo...')\\n#8 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/File.php\",\"Line\":369,\"User\":\"*****\"}"}