Nextcloud instance unreachable from Android client without VPN

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Nextcloud version: 20.0.7
Operating system and version: Ubuntu 18.04 on Linux 4.15.0-135-generic x86_64
Apache or nginx version: can't find it
PHP version (eg, 7.4): 7.4.15

The issue you are facing:
My NC instance is unreachable from the Android app, which only happens without an active VPN connection.
My setup has NC and Traefik v2 in a two docker containers in the same network. Traefik is handling reverse proxying to and from Nextcloud.
Everything works fine on my desktop, regardless of being connected to a VPN.

I have a feeling this has to do with my phoneā€™s DNS settings, so I changed them from Cloudflare to Quad9, no luck. I tried disconnecting from my VPN and using cellular data, it times out (guessing its unreachable due to IPv6 issues). I monitored Traefikā€™s requests through docker logs --follow traefik | grep nextcloud and none came (besides the ones when vpn enabled).
Iā€™m really not sure whatā€™s going on and Iā€™ve been scratching my head for a few days.

Is this the first time youā€™ve seen this error? (Y/N): Yes

Steps to replicate it:

  1. Log into NC instance on Android app with an active VPN connection. Everything works
  2. Disconnect from VPN
  3. ā€œServer not availableā€ above directory listing

The output of your Nextcloud log in Admin > Logging:

{"reqId":"WmnjokZAh400FJrtnGEs","level":2,"time":"2021-02-16T03:49:48+00:00","remoteAddr":"8.45.41.211","user":"--","app":"no app in context","method":"GET","url":"/","message":"Could not detect any host in https:///data/htaccesstest.txt","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":""}
{"reqId":"WmnjokZAh400FJrtnGEs","level":2,"time":"2021-02-16T03:49:48+00:00","remoteAddr":"8.45.41.211","user":"--","app":"no app in context","method":"GET","url":"/","message":"Could not detect any host in http:///data/htaccesstest.txt","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":""}
{"reqId":"IND36nO3kJBKxJhyQFaq","level":2,"time":"2021-02-16T03:49:48+00:00","remoteAddr":"8.45.41.211","user":"--","app":"no app in context","method":"GET","url":"/","message":"Could not detect any host in https:///data/htaccesstest.txt","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":""}
{"reqId":"IND36nO3kJBKxJhyQFaq","level":2,"time":"2021-02-16T03:49:48+00:00","remoteAddr":"8.45.41.211","user":"--","app":"no app in context","method":"GET","url":"/","message":"Could not detect any host in http:///data/htaccesstest.txt","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":""}
{"reqId":"ZeXVgfWr97XPS7Ss3wIi","level":2,"time":"2021-02-16T03:49:49+00:00","remoteAddr":"8.45.41.211","user":"--","app":"no app in context","method":"GET","url":"/","message":"Could not detect any host in https:///data/htaccesstest.txt","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":""}
{"reqId":"ZeXVgfWr97XPS7Ss3wIi","level":2,"time":"2021-02-16T03:49:49+00:00","remoteAddr":"8.45.41.211","user":"--","app":"no app in context","method":"GET","url":"/","message":"Could not detect any host in http:///data/htaccesstest.txt","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":""}
{"reqId":"trrdUQ80gekYpj78Jqsb","level":3,"time":"2021-02-16T03:50:00+00:00","remoteAddr":"","user":"--","app":"cron","method":"","url":"--","message":{"Exception":"Exception","Message":"Not installed","Code":0,"Trace":[{"file":"/config/www/nextcloud/lib/base.php","line":653,"function":"checkInstalled","class":"OC","type":"::"},{"file":"/config/www/nextcloud/lib/base.php","line":1091,"function":"init","class":"OC","type":"::"},{"file":"/config/www/nextcloud/cron.php","line":42,"args":["/config/www/nextcloud/lib/base.php"],"function":"require_once"}],"File":"/config/www/nextcloud/lib/base.php","Line":283,"CustomMessage":"--"},"userAgent":"--","version":""}
{"reqId":"eNPZ38lM8M1xrzhbQoUN","level":2,"time":"2021-02-16T03:50:17+00:00","remoteAddr":"8.45.41.211","user":"--","app":"no app in context","method":"POST","url":"/index.php","message":"Could not detect any host in https:///data/htaccesstest.txt","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":""}
{"reqId":"eNPZ38lM8M1xrzhbQoUN","level":2,"time":"2021-02-16T03:50:17+00:00","remoteAddr":"8.45.41.211","user":"--","app":"no app in context","method":"POST","url":"/index.php","message":"Could not detect any host in http:///data/htaccesstest.txt","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":""}
{"reqId":"9Fp2Dr6kL3aFB2KtPl9C","level":3,"time":"2021-02-16T03:52:56+00:00","remoteAddr":"8.45.41.211","user":"justin","app":"index","method":"GET","url":"/apps/theming/icon/files?v=0","message":{"Exception":"OCP\\Files\\NotPermittedException","Message":"Could not create folder","Code":0,"Trace":[{"file":"/config/www/nextcloud/lib/private/Files/AppData/AppData.php","line":157,"function":"newFolder","class":"OC\\Files\\Node\\Folder","type":"->"},{"file":"/config/www/nextcloud/apps/theming/lib/ImageManager.php","line":155,"function":"newFolder","class":"OC\\Files\\AppData\\AppData","type":"->"},{"file":"/config/www/nextcloud/apps/theming/lib/ImageManager.php","line":170,"function":"getCacheFolder","class":"OCA\\Theming\\ImageManager","type":"->"},{"file":"/config/www/nextcloud/apps/theming/lib/Controller/IconController.php","line":164,"function":"getCachedImage","class":"OCA\\Theming\\ImageManager","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":169,"function":"getTouchIcon","class":"OCA\\Theming\\Controller\\IconController","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":100,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/App.php","line":152,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/config/www/nextcloud/lib/private/Route/Router.php","line":309,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/config/www/nextcloud/lib/base.php","line":1008,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/config/www/nextcloud/index.php","line":37,"function":"handleRequest","class":"OC","type":"::"}],"File":"/config/www/nextcloud/lib/private/Files/Node/Folder.php","Line":167,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":"20.0.7.1"}
{"reqId":"Y5fZp5Dreyk292A4ERKn","level":3,"time":"2021-02-20T04:43:59+00:00","remoteAddr":"8.45.41.211","user":"justin","app":"PHP","method":"POST","url":"/apps/support/generateSystemReport","message":{"Exception":"Error","Message":"Undefined index: readonly at /config/www/nextcloud/apps/support/lib/Sections/ServerSection.php#268","Code":0,"Trace":[{"file":"/config/www/nextcloud/apps/support/lib/Sections/ServerSection.php","line":268,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::"},{"function":"OCA\\Support\\Sections\\{closure}","class":"OCA\\Support\\Sections\\ServerSection","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/config/www/nextcloud/apps/support/lib/Sections/ServerSection.php","line":257,"function":"array_map"},{"file":"/config/www/nextcloud/apps/support/lib/Sections/ServerSection.php","line":84,"function":"getExternalStorageInfo","class":"OCA\\Support\\Sections\\ServerSection","type":"->"},{"function":"__construct","class":"OCA\\Support\\Sections\\ServerSection","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":101,"function":"newInstanceArgs","class":"ReflectionClass","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":109,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":455,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":427,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":87,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":101,"function":"array_map"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":109,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":455,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":427,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/App.php","line":139,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/Route/Router.php","line":309,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/config/www/nextcloud/lib/base.php","line":1008,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/config/www/nextcloud/index.php","line":37,"function":"handleRequest","class":"OC","type":"::"}],"File":"/config/www/nextcloud/lib/private/Log/ErrorHandler.php","Line":91,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":"20.0.7.1"}
{"reqId":"Y5fZp5Dreyk292A4ERKn","level":3,"time":"2021-02-20T04:43:59+00:00","remoteAddr":"8.45.41.211","user":"justin","app":"PHP","method":"POST","url":"/apps/support/generateSystemReport","message":{"Exception":"Error","Message":"Undefined index: readonly at /config/www/nextcloud/apps/support/lib/Sections/ServerSection.php#268","Code":0,"Trace":[{"file":"/config/www/nextcloud/apps/support/lib/Sections/ServerSection.php","line":268,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::"},{"function":"OCA\\Support\\Sections\\{closure}","class":"OCA\\Support\\Sections\\ServerSection","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/config/www/nextcloud/apps/support/lib/Sections/ServerSection.php","line":257,"function":"array_map"},{"file":"/config/www/nextcloud/apps/support/lib/Sections/ServerSection.php","line":84,"function":"getExternalStorageInfo","class":"OCA\\Support\\Sections\\ServerSection","type":"->"},{"function":"__construct","class":"OCA\\Support\\Sections\\ServerSection","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":101,"function":"newInstanceArgs","class":"ReflectionClass","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":109,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":455,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":427,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":87,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":101,"function":"array_map"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":109,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":455,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":427,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/AppFramework/App.php","line":139,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/config/www/nextcloud/lib/private/Route/Router.php","line":309,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/config/www/nextcloud/lib/base.php","line":1008,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/config/www/nextcloud/index.php","line":37,"function":"handleRequest","class":"OC","type":"::"}],"File":"/config/www/nextcloud/lib/private/Log/ErrorHandler.php","Line":91,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":"20.0.7.1"}
{"reqId":"hI8EqfeLGrHgvsf1CQp4","level":2,"time":"2021-02-20T05:01:53+00:00","remoteAddr":"8.45.41.211","user":"--","app":"core","method":"GET","url":"/s/MRdwT3ndLiYjn43","message":"Renewing session token failed","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0","version":"20.0.7.1"}

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'datadirectory' => '/data',
  'instanceid' => '-----',
  'passwordsalt' => '-----',
  'secret' => '-----',
  'trusted_proxies' =>
  array (
    0 => '172.22.*.*',
  ),
  'trusted_domains' =>
  array (
    0 => 'nextcloud.itsa.computer',
    1 => '172.22.*.*',
  ),
  'dbtype' => 'mysql',
  'version' => '20.0.7.1',
  'overwrite.cli.url' => 'https://nextcloud.itsa.computer',
  'dbname' => 'nextcloud',
  'dbhost' => 'db:3306',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => '-----',
  'dbpassword' => '-----',
  'installed' => true,
);

The output of your Apache/nginx/system log in /var/log/____:

none

Iā€™ve attached my docker-compose.yml and docker inspect nextcloud/traefik

2

Do you still have this issue? I seem to have a similar problem where accessing Nextcloud from the Nextcloud Android app while on the same wifi network is fine, but using a cellular internet connection gives ā€˜server not availableā€™. When I use cellular + VPN I am able to access the server though (note this is a generic VPN, not a VPN to the network where the Nextcloud server is located). Interestingly, if I use cellular + PCAPdroid (a network monitoring app, which creates a fake VPN), I am also able to access the server.

What phone do you use? Iā€™m on a Samsung S10.

3

Yeah, still having this issue. It gets very problematic when using automatic uploads. Iā€™m on a Pixel 2 XL.

4

Did you ever come up with a solution to this? Iā€™m having the same issue as well. Itā€™s not a bad thing to constantly run my VPN I suppose, but it is confusing.
Also my Nextcloud instance is running via Docker, if that factors in at all.