The issue you are facing:
Session will not start, ‘normal’ php files work.
The output of your Nextcloud log in Admin > Logging:
==> /home/xxx/nextcloud/data/nextcloud.log <==
{"reqId":"tHTCnJCUHT8P280XInzK","level":3,"time":"2019-11-28T14:11:45+00:00","remoteAddr":"212.45.54.84","user":"--","app":"base","method":"GET","url":"\/status.php","message":{"Exception":"Exception","Message":"Failed to start session","Code":0,"Trace":[{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":424,"function":"__construct","class":"OC\\Session\\Internal","type":"->","args":["oc7o27t7q1vk"]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":642,"function":"initSession","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":1081,"function":"init","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/status.php","line":36,"args":["\/home\/nas5\/nextcloud\/lib\/base.php"],"function":"require_once"}],"File":"\/home\/nas5\/nextcloud\/lib\/private\/Session\/Internal.php","Line":61,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.1stable-Win64 (build 20191105) (Nextcloud)","version":"17.0.1.1"}
ikkuh@stats1:/home/xxx/nextcloud# cat version.php
> <?php
> $OC_Version = array(17,0,1,1);
> $OC_VersionString = '17.0.1';
> $OC_Edition = '';
> $OC_Channel = 'stable';
> $OC_VersionCanBeUpgradedFrom = array (
> 'nextcloud' =>
> array (
> '16.0' => true,
> '17.0' => true,
> ),
> 'owncloud' =>
> array (
> ),
> );
> $OC_Build = '2019-11-07T12:06:23+00:00 a8405bf175d9924309b3889948b8fb26aa707fd6';
> $vendor = 'nextcloud';
The output of your config.php file in `/path/to/nextcloud` (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in `/var/log/____`:
> ==> /home/nas5/logs/access_log <==
212.45.54.84 - - [28/Nov/2019:15:20:30 +0100] “GET / HTTP/1.1” 500 3236 “-” “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36”
212.45.54.84 - - [28/Nov/2019:15:20:31 +0100] “GET /core/css/guest.css?v=1ed03cae-0 HTTP/1.1” 500 3236 “-” “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36”
212.45.54.84 - - [28/Nov/2019:15:20:31 +0100] “GET /core/js/dist/main.js?v=1ed03cae-0 HTTP/1.1” 500 3236 “-” “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36”
212.45.54.84 - - [28/Nov/2019:15:20:31 +0100] “GET /js/core/merged-template-prepend.js?v=1ed03cae-0 HTTP/1.1” 500 3236 “-” “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36”
==> /home/nas5/nextcloud/data/nextcloud.log <==
> {"reqId":"FjgpysKcIUryMvVAUL2V","level":3,"time":"2019-11-28T14:20:31+00:00","remoteAddr":"212.45.54.84","user":"--","app":"base","method":"GET","url":"\/core\/css\/guest.css?v=1ed03cae-0","message":{"Exception":"Exception","Message":"Failed to start session","Code":0,"Trace":[{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":424,"function":"__construct","class":"OC\\Session\\Internal","type":"->","args":["oc7o27t7q1vk"]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":642,"function":"initSession","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":1081,"function":"init","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/index.php","line":40,"args":["\/home\/nas5\/nextcloud\/lib\/base.php"],"function":"require_once"}],"File":"\/home\/nas5\/nextcloud\/lib\/private\/Session\/Internal.php","Line":61,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/78.0.3904.108 Safari\/537.36","version":"17.0.1.1"}
> {"reqId":"O0Oa5xpkhx2posDj2jx7","level":3,"time":"2019-11-28T14:20:31+00:00","remoteAddr":"212.45.54.84","user":"--","app":"base","method":"GET","url":"\/core\/search\/js\/search.js?v=1ed03cae-0","message":{"Exception":"Exception","Message":"Failed to start session","Code":0,"Trace":[{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":424,"function":"__construct","class":"OC\\Session\\Internal","type":"->","args":["oc7o27t7q1vk"]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":642,"function":"initSession","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":1081,"function":"init","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/index.php","line":40,"args":["\/home\/nas5\/nextcloud\/lib\/base.php"],"function":"require_once"}],"File":"\/home\/nas5\/nextcloud\/lib\/private\/Session\/Internal.php","Line":61,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/78.0.3904.108 Safari\/537.36","version":"17.0.1.1"}
> {"reqId":"Q9nqiXDiuDIn9hGSxCA1","level":3,"time":"2019-11-28T14:20:31+00:00","remoteAddr":"212.45.54.84","user":"--","app":"base","method":"GET","url":"\/core\/search\/js\/searchprovider.js?v=1ed03cae-0","message":{"Exception":"Exception","Message":"Failed to start session","Code":0,"Trace":[{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":424,"function":"__construct","class":"OC\\Session\\Internal","type":"->","args":["oc7o27t7q1vk"]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":642,"function":"initSession","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":1081,"function":"init","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/index.php","line":40,"args":["\/home\/nas5\/nextcloud\/lib\/base.php"],"function":"require_once"}],"File":"\/home\/nas5\/nextcloud\/lib\/private\/Session\/Internal.php","Line":61,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/78.0.3904.108 Safari\/537.36","version":"17.0.1.1"}
> {"reqId":"k0YQyzOKUv6KSZ0z9ftR","level":3,"time":"2019-11-28T14:20:31+00:00","remoteAddr":"212.45.54.84","user":"--","app":"base","method":"GET","url":"\/core\/js\/files\/fileinfo.js?v=1ed03cae-0","message":{"Exception":"Exception","Message":"Failed to start session","Code":0,"Trace":[{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":424,"function":"__construct","class":"OC\\Session\\Internal","type":"->","args":["oc7o27t7q1vk"]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":642,"function":"initSession","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":1081,"function":"init","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/index.php","line":40,"args":["\/home\/nas5\/nextcloud\/lib\/base.php"],"function":"require_once"}],"File":"\/home\/nas5\/nextcloud\/lib\/private\/Session\/Internal.php","Line":61,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/78.0.3904.108 Safari\/537.36","version":"17.0.1.1"}
> {"reqId":"YwFzAsuiJRFDjsokX5mb","level":3,"time":"2019-11-28T14:20:32+00:00","remoteAddr":"212.45.54.84","user":"--","app":"base","method":"GET","url":"\/core\/js\/files\/client.js?v=1ed03cae-0","message":{"Exception":"Exception","Message":"Failed to start session","Code":0,"Trace":[{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":424,"function":"__construct","class":"OC\\Session\\Internal","type":"->","args":["oc7o27t7q1vk"]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":642,"function":"initSession","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":1081,"function":"init","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/index.php","line":40,"args":["\/home\/nas5\/nextcloud\/lib\/base.php"],"function":"require_once"}],"File":"\/home\/nas5\/nextcloud\/lib\/private\/Session\/Internal.php","Line":61,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/78.0.3904.108 Safari\/537.36","version":"17.0.1.1"}
> {"reqId":"KV3D4Djb09uYr3B7xhoa","level":3,"time":"2019-11-28T14:20:32+00:00","remoteAddr":"212.45.54.84","user":"--","app":"base","method":"GET","url":"\/core\/img\/favicon.ico","message":{"Exception":"Exception","Message":"Failed to start session","Code":0,"Trace":[{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":424,"function":"__construct","class":"OC\\Session\\Internal","type":"->","args":["oc7o27t7q1vk"]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":642,"function":"initSession","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":1081,"function":"init","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/index.php","line":40,"args":["\/home\/nas5\/nextcloud\/lib\/base.php"],"function":"require_once"}],"File":"\/home\/nas5\/nextcloud\/lib\/private\/Session\/Internal.php","Line":61,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/78.0.3904.108 Safari\/537.36","version":"17.0.1.1"}
> {"reqId":"los3xndoY8NjJBT3OBTE","level":3,"time":"2019-11-28T14:20:32+00:00","remoteAddr":"212.45.54.84","user":"--","app":"base","method":"GET","url":"\/core\/img\/manifest.json","message":{"Exception":"Exception","Message":"Failed to start session","Code":0,"Trace":[{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":424,"function":"__construct","class":"OC\\Session\\Internal","type":"->","args":["oc7o27t7q1vk"]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":642,"function":"initSession","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/lib\/base.php","line":1081,"function":"init","class":"OC","type":"::","args":[]},{"file":"\/home\/nas5\/nextcloud\/index.php","line":40,"args":["\/home\/nas5\/nextcloud\/lib\/base.php"],"function":"require_once"}],"File":"\/home\/nas5\/nextcloud\/lib\/private\/Session\/Internal.php","Line":61,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/78.0.3904.108 Safari\/537.36","version":"17.0.1.1"}
==> /home/nas5/logs/access_log <==>
> 212.45.54.84 - - [28/Nov/2019:15:20:31 +0100] "GET /core/css/guest.css?v=1ed03cae-0 HTTP/1.1" 500 3236 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"
> 212.45.54.84 - - [28/Nov/2019:15:20:31 +0100] "GET /core/search/js/search.js?v=1ed03cae-0 HTTP/1.1" 500 3236 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"
> 212.45.54.84 - - [28/Nov/2019:15:20:31 +0100] "GET /core/search/js/searchprovider.js?v=1ed03cae-0 HTTP/1.1" 500 3236 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"
> 212.45.54.84 - - [28/Nov/2019:15:20:31 +0100] "GET /core/js/files/fileinfo.js?v=1ed03cae-0 HTTP/1.1" 500 3236 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"
> 212.45.54.84 - - [28/Nov/2019:15:20:32 +0100] "GET /core/js/files/client.js?v=1ed03cae-0 HTTP/1.1" 500 3236 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"
> 212.45.54.84 - - [28/Nov/2019:15:20:32 +0100] "GET /core/img/favicon.ico HTTP/1.1" 500 3236 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"
> 212.45.54.84 - - [28/Nov/2019:15:20:32 +0100] "GET /core/img/manifest.json HTTP/1.1" 500 3236 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"