Core: Owncloud says it has no internet connection?

[frozen1980]

Steps to reproduce

1. Unknown, I just upgraded to OC 8.1
   

   Expected behaviour

Show no error and be able to install apps

Actual behaviour

I see an error message in the Admin-Page stating owncloud has no internet connection.
Also I can't install apps, I just get "cURL error 56: Proxy CONNECT aborted" but I do not use any proxy. I downloaded and installed my needed apps manually..
Using test.php from https://github.com/owncloud/core/issues/16255#issuecomment-112481294 I get 200 and 301 and since I am not on Fedora / CentOS I am probably not affected by issue #16255

Server configuration

Operating system: Debian stable (8.1)

Web server: Apache/2.4.10

Database: mysql Ver 14.14 Distrib 5.5.43

PHP version: PHP 5.6.9-0+deb8u1

ownCloud version: ownCloud 8.1.0 (stable)

Updated from an older ownCloud or fresh install: Update from 8.0.4
Enabled:

• activity: 2.0.1
• bookmarks: 0.4
• calendar: 0.7.1
• contacts: 0.4.0.0
• files: 1.1.9
• files_pdfviewer: 0.7
• files_sharing: 0.6.2
• files_texteditor: 0.4
• files_trashbin: 0.6.3
• files_versions: 1.0.6
• gallery: 0.6.0

Disabled:

• encryption
• external
• files_external
• files_locking
• files_videoviewer
• firstrunwizard
• provisioning_api
• templateeditor
• updater
• user_external
• user_ldap
• user_webdavauth

The content of config/config.php:
define('DEBUG',true);
$CONFIG = array (
'installed' => true,
'dbtype' => 'mysql',
'dbname' => 'ownclouddb',
'dbuser' => 'owncloud',
'dbpassword' => 'removed',
'dbhost' => 'localhost',
'dbtableprefix' => 'oc_',
'passwordsalt' => 'removed',
'forcessl' => true,
'blacklisted_files' =>
array (
0 => '.htaccess',
),
'overwritehost' => '',
'overwriteprotocol' => '',
'overwritewebroot' => '',
'overwritecondaddr' => '',
'proxy' => '',
'proxyuserpwd' => '',
'theme' => '',
'default_language' => 'de',
'3rdpartyroot' => '',
'3rdpartyurl' => '',
'defaultapp' => 'files',
'knowledgebaseenabled' => true,
'knowledgebaseurl' => 'http://api.apps.owncloud.com/v1',
'appstoreenabled' => true,
'appstoreurl' => 'http://api.apps.owncloud.com/v1',
'mail_smtpdebug' => false,
'mail_smtpmode' => 'php',
'mail_smtphost' => '127.0.0.1',
'mail_smtpport' => '25',
'mail_smtptimeout' => 10,
'mail_smtpauthtype' => 'LOGIN',
'trashbin_retention_obligation' => 180,
'allow_user_to_change_display_name' => true,
'appcodechecker' => '',
'updatechecker' => true,
'log_type' => 'owncloud',
'logfile' => '',
'loglevel' => 0,
'remember_login_cookie_lifetime' => 1296000,
'session_lifetime' => 86400,
'custom_csp_policy' => 'default-src \'self\'; script-src \'self\' \'unsafe-eval\'; style-src \'self\' \'unsafe-inline\'; frame-src *; img-src *; font-src \'self\' data:; media-src *',
'xframe_restriction' => true,
'maintenance' => false,
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/server/owncloud/apps',
'url' => '/apps',
'writable' => true,
),
),
'customclient_desktop' => '',
'customclient_android' => '',
'customclient_ios' => '',
'logdateformat' => 'F d, Y H:i:s',
'logtimezone' => 'Europe/Berlin',
'instanceid' => 'removed',
'version' => '8.1.0.8',
'trusted_domains' =>
array (
0 => 'www.mydomain.de',
),
'mail_from_address' => 'webmaster',
'mail_domain' => 'mydomain.de',
'secret' => 'removed',
'singleuser' => false,
'memcache.local' => '\OC\Memcache\APCu',
);

Are you using external storage, if yes which one: none

Are you using encryption: no

Are you using an external user-backend, if yes which one: none

Client configuration

Browser: Several

Operating system: Several

Logs

Web server error log

Nothing interesting

ownCloud log (data/owncloud.log)

{"reqId":"++8tJ+CD+qfRclQdF7m7","remoteAddr":"93.130.229.15","app":"core","message":"No update found at the ownCloud appstore for app 166056","level":1,"time":"July 10, 2015 17:02:59","method":"GET","url":"\/owncloud\/index.php\/settings\/apps\/list?category=0&includeUpdateInfo=1"}
{"reqId":"++8tJ+CD+qfRclQdF7m7","remoteAddr":"93.130.229.15","app":"core","message":"No update found at the ownCloud appstore for app 166051","level":1,"time":"July 10, 2015 17:02:59","method":"GET","url":"\/owncloud\/index.php\/settings\/apps\/list?category=0&includeUpdateInfo=1"}
{"reqId":"++8tJ+CD+qfRclQdF7m7","remoteAddr":"93.130.229.15","app":"core","message":"No update found at the ownCloud appstore for app 166049","level":1,"time":"July 10, 2015 17:02:59","method":"GET","url":"\/owncloud\/index.php\/settings\/apps\/list?category=0&includeUpdateInfo=1"}
{"reqId":"iqvOjfVr01MMlcbDUsnC","remoteAddr":"93.130.229.15","app":"core","message":"cURL error 56: Proxy CONNECT aborted","level":3,"time":"July 10, 2015 17:03:18","method":"POST","url":"\/owncloud\/index.php\/settings\/ajax\/enableapp.php"}
{"reqId":"NYRh4Js+uZw3IJnT6gKG","remoteAddr":"","app":"PHP","message":"Undefined index: REQUEST_URI at \/var\/www\/server\/owncloud\/apps\/contacts\/appinfo\/app.php#35","level":0,"time":"July 10, 2015 17:09:16","method":"--","url":"--"}
{"reqId":"Q6cKpVI8hh+55HGSDKnL","remoteAddr":"","app":"PHP","message":"Undefined index: REQUEST_URI at \/var\/www\/server\/owncloud\/apps\/contacts\/appinfo\/app.php#35","level":0,"time":"July 10, 2015 17:09:45","method":"--","url":"--"}
{"reqId":"t00nFR9KyIBU3c0zIbFu","remoteAddr":"","app":"PHP","message":"Undefined index: REQUEST_URI at \/var\/www\/server\/owncloud\/apps\/contacts\/appinfo\/app.php#35","level":0,"time":"July 10, 2015 17:10:05","method":"--","url":"--"}
{"reqId":"rAflbGKd1h3FB+BTASnL","remoteAddr":"","app":"PHP","message":"Undefined index: REQUEST_URI at \/var\/www\/server\/owncloud\/apps\/contacts\/appinfo\/app.php#35","level":0,"time":"July 10, 2015 17:10:09","method":"--","url":"--"}
{"reqId":"E6ZKEHG6bcqIWKcG8P\/V","remoteAddr":"","app":"PHP","message":"Undefined index: REQUEST_URI at \/var\/www\/server\/owncloud\/apps\/contacts\/appinfo\/app.php#35","level":0,"time":"July 10, 2015 17:10:11","method":"--","url":"--"}
{"reqId":"7zSXkcQTVyWUqa8TzTtE","remoteAddr":"","app":"PHP","message":"Undefined index: REQUEST_URI at \/var\/www\/server\/owncloud\/apps\/contacts\/appinfo\/app.php#35","level":0,"time":"July 10, 2015 17:10:14","method":"--","url":"--"}

[rullzer]

Did you just copy the config sample file and modify it? Because we had that issue before... (CC: @DeepDiver1975 @LukasReschke , do you remember that as well?)

Try to remove the proxy related stuff

'proxy' => '',
'proxyuserpwd' => '',

[frozen1980]

I can't remember doing such a thing, but it's an old installation, updated all the way from at least 5.0.13..

Thanks for that hint, this did solve the problem.. Sometimes one seems to be blind.. :-)

Now calendar and contacts seem to be experimental which seems weird, but this is an entirely different thing.

Thank you very much!