Unable to connect owncloud app via SSL-Reverseproxy (Apache)

Actual behaviour

Actually it is possible to open owncloud in browser via smartphone or PC. But in app I only receive the message “Server Konfiguration Fehlerhaft” (sorry I don’t know how to force english language in app. Maybe that’s the same as “malformed server configuration”?!)

Expected behaviour

Login prompt should be displayed after entering URL in app.

Steps to reproduce

Can this problem be reproduced with the official owncloud server?
(url: https://demo.owncloud.org, user: test, password: test)

-No, It’s working
But without my SSL-Reverseproxy it’s also working locally in LAN

Environment data

My Configuration:

Owncloud runs as docker container in QNAPs Container Station with following config.php

<?php
$CONFIG = array (
  'instanceid' => 'oc7h4o8q9e09',
  'passwordsalt' => 'secret',
  'secret' => 'secret',
  'trusted_domains' =>
  array (
    0 => 'homeserver:6080',
    1 => 'secret.myqnapcloud.com:8081',
),
  'datadirectory' => '/var/www/html/data',
#  'overwrite.cli.url' => 'https://secret.myqnapcloud.com:8081/owncloud',
  'trusted_proxies' => ['10.0.3.1'],
  'overwritehost' => 'secret.myqnapcloud.com:8081',
  'overwriteprotocol' => 'https',
  'overwritewebroot' => '/owncloud',
  'overwritecondaddr' => '^10\.0\.3\.1$',
'dbtype' => 'mysql',
  'version' => '10.0.10.4',
  'dbname' => 'owncloud',
  'dbhost' => 'homeserver',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'secret',
  'dbpassword' => 'secret',
  'logtimezone' => 'UTC',
  'installed' => true,
);

QNAPs Apache is used as SSL-Reverse Proxy to be able to use QNAPs Let’s Encrypt Certificate.

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule ssl_module modules/mod_ssl.so

<VirtualHost *:8081>
        RequestHeader set X-Apache-Proxy "https"
	ServerName secret.myqnapcloud.com

	SSLEngine On
	SSLProxyEngine On
	SSLHonorCipherOrder on
	SSLCipherSuite EECDH+CHACHA20:EECDH+CHACHA20-draft:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:!MD5
	SSLProtocol All -SSLv2 -SSLv3

	SSLCertificateFile "/etc/stunnel/stunnel.pem"
	SSLCertificateChainFile "/etc/stunnel/uca.pem"

	ProxyPreserveHost On
	ProxyRequests Off
	ProxyVia Off

    <Location /owncloud>
            Order deny,allow
            ProxyPass http://127.0.0.1:6080/
            ProxyPassReverse http://127.0.0.1:6080/
    </Location>

    <Proxy *>
            Order deny,allow
            Allow from all

    </Proxy>


    DocumentRoot "/share/Web"

    <Directory "/share/Web">
            Options FollowSymLinks MultiViews
            Order allow,deny
            Allow from all
    </Directory>
</VirtualHost>


<VirtualHost *:80>
    ServerName secret.myqnapcloud.com
    Redirect / https://secret.myqnapcloud.com:8081/
</VirtualHost>

Android version: 9

Device model: Huawey P20 Pro

Stock or customized system: Stock

ownCloud app version: 2.14.2

ownCloud server version: official latest docker container (10.0.10)

Logs

Web server error log

That’s not so easy because it’s running inside a docker container and to log directories are not exposed
But this here is, what I see on console prompt. Here are some connection trials from smartphone.

10.0.3.1 - - [09/Feb/2020:12:51:27 +0000] "PROPFIND //remote.php/dav/files/ HTTP/1.1" 500 9406 "-" "Mozilla/5.0 (Android) ownCloud-android/2.14.2"
10.0.3.1 - - [09/Feb/2020:12:51:34 +0000] "GET //status.php HTTP/1.1" 200 1208 "-" "Mozilla/5.0 (Android) ownCloud-android/2.14.2"
10.0.3.1 - - [09/Feb/2020:12:51:35 +0000] "PROPFIND //remote.php/dav/files/ HTTP/1.1" 500 9406 "-" "Mozilla/5.0 (Android) ownCloud-android/2.14.2"
10.0.3.1 - - [09/Feb/2020:12:51:36 +0000] "GET //status.php HTTP/1.1" 200 1198 "-" "Mozilla/5.0 (Android) ownCloud-android/2.14.2"
10.0.3.1 - - [09/Feb/2020:12:51:36 +0000] "PROPFIND //remote.php/dav/files/ HTTP/1.1" 500 9406 "-" "Mozilla/5.0 (Android) ownCloud-android/2.14.2"
10.0.3.1 - - [09/Feb/2020:12:51:37 +0000] "GET //status.php HTTP/1.1" 200 1208 "-" "Mozilla/5.0 (Android) ownCloud-android/2.14.2"
10.0.3.1 - - [09/Feb/2020:12:51:37 +0000] "PROPFIND //remote.php/dav/files/ HTTP/1.1" 500 9406 "-" "Mozilla/5.0 (Android) ownCloud-android/2.14.2" 
10.0.3.1 - - [09/Feb/2020:12:51:38 +0000] "GET //status.php HTTP/1.1" 200 1200 "-" "Mozilla/5.0 (Android) ownCloud-android/2.14.2"                                                                                                                                           
10.0.3.1 - - [09/Feb/2020:12:51:38 +0000] "PROPFIND //remote.php/dav/files/ HTTP/1.1" 500 9406 "-" "Mozilla/5.0 (Android) ownCloud-android/2.14.2"
#### ownCloud log (data/owncloud.log)
{"reqId":"eJw36sqz9NQXbOz8r9pG","level":4,"time":"2020-02-09T12:15:29+00:00","remoteAddr":"88.117.117.170","user":"admaim","app":"webdav","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/webdav\/","message":"Exception: Requested uri (\/owncloud\/remote.phpp\/webdav\/) is out of base uri (\/owncloud\/remote.php\/webdav\/): {\"Exception\":\"LogicException\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/webdav\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/webdav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/CorsPlugin.php(77): Sabre\\\\HTTP\\\\Request->getPath()\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/CorsPlugin.php(124): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\CorsPlugin->getExtraHeaders(Object(Sabre\\\\HTTP\\\\Request))\\n#2 [internal function]: OCA\\\\DAV\\\\Connector\\\\Sabre\\\\CorsPlugin->setCorsHeaders(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#3 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(466): Sabre\\\\Event\\\\EventEmitter->emit('beforeMethod', Array)\\n#5 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#6 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(64): Sabre\\\\DAV\\\\Server->exec()\\n#7 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#8 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/http\\\/lib\\\/Request.php\",\"Line\":214}"}
{"reqId":"7m0pWJyf64Ye61w3VPct","level":4,"time":"2020-02-09T12:15:42+00:00","remoteAddr":"88.117.117.170","user":"admaim","app":"webdav","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/webdav\/","message":"Exception: Requested uri (\/owncloud\/remote.phpp\/webdav\/) is out of base uri (\/owncloud\/remote.php\/webdav\/): {\"Exception\":\"LogicException\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/webdav\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/webdav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/CorsPlugin.php(77): Sabre\\\\HTTP\\\\Request->getPath()\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/CorsPlugin.php(124): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\CorsPlugin->getExtraHeaders(Object(Sabre\\\\HTTP\\\\Request))\\n#2 [internal function]: OCA\\\\DAV\\\\Connector\\\\Sabre\\\\CorsPlugin->setCorsHeaders(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#3 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(466): Sabre\\\\Event\\\\EventEmitter->emit('beforeMethod', Array)\\n#5 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#6 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(64): Sabre\\\\DAV\\\\Server->exec()\\n#7 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#8 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/http\\\/lib\\\/Request.php\",\"Line\":214}"}
{"reqId":"eqFf1LOujom6hFlIxiVC","level":4,"time":"2020-02-09T12:15:43+00:00","remoteAddr":"88.117.117.170","user":"admaim","app":"webdav","method":"REPORT","url":"\/owncloud\/remote.phpp\/webdav\/","message":"Exception: Requested uri (\/owncloud\/remote.phpp\/webdav\/) is out of base uri (\/owncloud\/remote.php\/webdav\/): {\"Exception\":\"LogicException\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/webdav\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/webdav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/CorsPlugin.php(77): Sabre\\\\HTTP\\\\Request->getPath()\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/CorsPlugin.php(124): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\CorsPlugin->getExtraHeaders(Object(Sabre\\\\HTTP\\\\Request))\\n#2 [internal function]: OCA\\\\DAV\\\\Connector\\\\Sabre\\\\CorsPlugin->setCorsHeaders(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#3 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(466): Sabre\\\\Event\\\\EventEmitter->emit('beforeMethod', Array)\\n#5 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#6 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(64): Sabre\\\\DAV\\\\Server->exec()\\n#7 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#8 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/http\\\/lib\\\/Request.php\",\"Line\":214}"}
{"reqId":"9u42jKcuo4nVIhruhIzs","level":4,"time":"2020-02-09T12:15:44+00:00","remoteAddr":"88.117.117.170","user":"admaim","app":"webdav","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/webdav\/","message":"Exception: Requested uri (\/owncloud\/remote.phpp\/webdav\/) is out of base uri (\/owncloud\/remote.php\/webdav\/): {\"Exception\":\"LogicException\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/webdav\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/webdav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/CorsPlugin.php(77): Sabre\\\\HTTP\\\\Request->getPath()\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/CorsPlugin.php(124): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\CorsPlugin->getExtraHeaders(Object(Sabre\\\\HTTP\\\\Request))\\n#2 [internal function]: OCA\\\\DAV\\\\Connector\\\\Sabre\\\\CorsPlugin->setCorsHeaders(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#3 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(466): Sabre\\\\Event\\\\EventEmitter->emit('beforeMethod', Array)\\n#5 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#6 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(64): Sabre\\\\DAV\\\\Server->exec()\\n#7 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#8 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/http\\\/lib\\\/Request.php\",\"Line\":214}"}
{"reqId":"68GdLUVRMmY62Doj6N47","level":4,"time":"2020-02-09T12:15:46+00:00","remoteAddr":"88.117.117.170","user":"admaim","app":"webdav","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/webdav\/","message":"Exception: Requested uri (\/owncloud\/remote.phpp\/webdav\/) is out of base uri (\/owncloud\/remote.php\/webdav\/): {\"Exception\":\"LogicException\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/webdav\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/webdav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/CorsPlugin.php(77): Sabre\\\\HTTP\\\\Request->getPath()\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/CorsPlugin.php(124): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\CorsPlugin->getExtraHeaders(Object(Sabre\\\\HTTP\\\\Request))\\n#2 [internal function]: OCA\\\\DAV\\\\Connector\\\\Sabre\\\\CorsPlugin->setCorsHeaders(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#3 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(466): Sabre\\\\Event\\\\EventEmitter->emit('beforeMethod', Array)\\n#5 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#6 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(64): Sabre\\\\DAV\\\\Server->exec()\\n#7 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#8 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/http\\\/lib\\\/Request.php\",\"Line\":214}"}
{"reqId":"dc976198-2d11-4671-a097-2886dd3bd72d","level":3,"time":"2020-02-09T12:16:04+00:00","remoteAddr":"88.117.117.170","user":"--","app":"remote","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/dav\/files\/","message":"Exception: {\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\Forbidden\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/dav\\\/files\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/dav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(549): Sabre\\\\DAV\\\\Server->calculateUri('\\\/owncloud\\\/remot...')\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(308): Sabre\\\\DAV\\\\Server->getRequestUri()\\n#2 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(145): OCA\\\\DAV\\\\Server->isRequestForSubtree(Array)\\n#3 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(30): OCA\\\\DAV\\\\Server->__construct(Object(OC\\\\AppFramework\\\\Http\\\\Request), '\\\/owncloud\\\/remot...')\\n#4 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":588}"}
{"reqId":"9a9d1f30-6b46-4879-b7b9-aeddcf1c065d","level":3,"time":"2020-02-09T12:16:05+00:00","remoteAddr":"88.117.117.170","user":"--","app":"remote","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/dav\/files\/","message":"Exception: {\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\Forbidden\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/dav\\\/files\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/dav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(549): Sabre\\\\DAV\\\\Server->calculateUri('\\\/owncloud\\\/remot...')\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(308): Sabre\\\\DAV\\\\Server->getRequestUri()\\n#2 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(145): OCA\\\\DAV\\\\Server->isRequestForSubtree(Array)\\n#3 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(30): OCA\\\\DAV\\\\Server->__construct(Object(OC\\\\AppFramework\\\\Http\\\\Request), '\\\/owncloud\\\/remot...')\\n#4 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":588}"}
{"reqId":"be1eb0a1-a514-46dc-a402-2a028e920afc","level":3,"time":"2020-02-09T12:16:06+00:00","remoteAddr":"88.117.117.170","user":"--","app":"remote","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/dav\/files\/","message":"Exception: {\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\Forbidden\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/dav\\\/files\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/dav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(549): Sabre\\\\DAV\\\\Server->calculateUri('\\\/owncloud\\\/remot...')\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(308): Sabre\\\\DAV\\\\Server->getRequestUri()\\n#2 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(145): OCA\\\\DAV\\\\Server->isRequestForSubtree(Array)\\n#3 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(30): OCA\\\\DAV\\\\Server->__construct(Object(OC\\\\AppFramework\\\\Http\\\\Request), '\\\/owncloud\\\/remot...')\\n#4 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":588}"}
{"reqId":"73f3c3e1-e1e7-44de-adf1-bcd1669ad0ab","level":3,"time":"2020-02-09T12:20:18+00:00","remoteAddr":"88.117.117.170","user":"--","app":"remote","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/dav\/files\/","message":"Exception: {\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\Forbidden\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/dav\\\/files\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/dav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(549): Sabre\\\\DAV\\\\Server->calculateUri('\\\/owncloud\\\/remot...')\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(308): Sabre\\\\DAV\\\\Server->getRequestUri()\\n#2 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(145): OCA\\\\DAV\\\\Server->isRequestForSubtree(Array)\\n#3 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(30): OCA\\\\DAV\\\\Server->__construct(Object(OC\\\\AppFramework\\\\Http\\\\Request), '\\\/owncloud\\\/remot...')\\n#4 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":588}"}
{"reqId":"7b6c50e0-37dc-4ce3-bf25-c0ec30ca7a23","level":3,"time":"2020-02-09T12:51:27+00:00","remoteAddr":"88.117.117.170","user":"--","app":"remote","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/dav\/files\/","message":"Exception: {\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\Forbidden\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/dav\\\/files\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/dav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(549): Sabre\\\\DAV\\\\Server->calculateUri('\\\/owncloud\\\/remot...')\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(308): Sabre\\\\DAV\\\\Server->getRequestUri()\\n#2 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(145): OCA\\\\DAV\\\\Server->isRequestForSubtree(Array)\\n#3 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(30): OCA\\\\DAV\\\\Server->__construct(Object(OC\\\\AppFramework\\\\Http\\\\Request), '\\\/owncloud\\\/remot...')\\n#4 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":588}"}
{"reqId":"c040cc2d-ad17-42ce-aa03-9fb9494e6640","level":3,"time":"2020-02-09T12:51:35+00:00","remoteAddr":"88.117.117.170","user":"--","app":"remote","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/dav\/files\/","message":"Exception: {\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\Forbidden\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/dav\\\/files\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/dav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(549): Sabre\\\\DAV\\\\Server->calculateUri('\\\/owncloud\\\/remot...')\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(308): Sabre\\\\DAV\\\\Server->getRequestUri()\\n#2 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(145): OCA\\\\DAV\\\\Server->isRequestForSubtree(Array)\\n#3 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(30): OCA\\\\DAV\\\\Server->__construct(Object(OC\\\\AppFramework\\\\Http\\\\Request), '\\\/owncloud\\\/remot...')\\n#4 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":588}"}
{"reqId":"a36f28ed-b5ce-418a-b60d-45c84a320df4","level":3,"time":"2020-02-09T12:51:36+00:00","remoteAddr":"88.117.117.170","user":"--","app":"remote","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/dav\/files\/","message":"Exception: {\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\Forbidden\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/dav\\\/files\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/dav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(549): Sabre\\\\DAV\\\\Server->calculateUri('\\\/owncloud\\\/remot...')\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(308): Sabre\\\\DAV\\\\Server->getRequestUri()\\n#2 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(145): OCA\\\\DAV\\\\Server->isRequestForSubtree(Array)\\n#3 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(30): OCA\\\\DAV\\\\Server->__construct(Object(OC\\\\AppFramework\\\\Http\\\\Request), '\\\/owncloud\\\/remot...')\\n#4 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":588}"}
{"reqId":"ad57c778-dff0-43f5-a8fd-bf1ee31521aa","level":3,"time":"2020-02-09T12:51:37+00:00","remoteAddr":"88.117.117.170","user":"--","app":"remote","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/dav\/files\/","message":"Exception: {\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\Forbidden\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/dav\\\/files\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/dav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(549): Sabre\\\\DAV\\\\Server->calculateUri('\\\/owncloud\\\/remot...')\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(308): Sabre\\\\DAV\\\\Server->getRequestUri()\\n#2 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(145): OCA\\\\DAV\\\\Server->isRequestForSubtree(Array)\\n#3 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(30): OCA\\\\DAV\\\\Server->__construct(Object(OC\\\\AppFramework\\\\Http\\\\Request), '\\\/owncloud\\\/remot...')\\n#4 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":588}"}
{"reqId":"a2b6e67c-9234-405d-b225-a062234e107b","level":3,"time":"2020-02-09T12:51:38+00:00","remoteAddr":"88.117.117.170","user":"--","app":"remote","method":"PROPFIND","url":"\/owncloud\/remote.phpp\/dav\/files\/","message":"Exception: {\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\Forbidden\",\"Message\":\"Requested uri (\\\/owncloud\\\/remote.phpp\\\/dav\\\/files\\\/) is out of base uri (\\\/owncloud\\\/remote.php\\\/dav\\\/)\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(549): Sabre\\\\DAV\\\\Server->calculateUri('\\\/owncloud\\\/remot...')\\n#1 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(308): Sabre\\\\DAV\\\\Server->getRequestUri()\\n#2 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/lib\\\/Server.php(145): OCA\\\\DAV\\\\Server->isRequestForSubtree(Array)\\n#3 \\\/var\\\/www\\\/html\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(30): OCA\\\\DAV\\\\Server->__construct(Object(OC\\\\AppFramework\\\\Http\\\\Request), '\\\/owncloud\\\/remot...')\\n#4 \\\/var\\\/www\\\/html\\\/remote.php(165): require_once('\\\/var\\\/www\\\/html\\\/a...')\\n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":588}"}

For some reason your phone seems to be requesting
/owncloud/remote.phpp/webdav/
instead of
/owncloud/remote.php/webdav/
??