Login-loop in Webpanel

Steps to reproduce
1. Install OwnCloud on a subdomain
2. Configure SSL
3. Finish the setup
4. Try to login

Expected behaviour
User should be redirected into the Webpanel (apps=files)

Actual behaviour
User gets redirected to https://cloud.xxxxx.de/index.php/login?redirect_url=%252Findex.php%252Fapps%252Ffiles%252F and is asked to login again

Server configuration
Operating system: Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64 GNU/Linux
Web server: Apache/2.4.10 (Debian)
Database: mysqld Ver 5.5.54-0+deb8u1 for debian-linux-gnu
PHP version: PHP 5.6.30-0+deb8u1
ownCloud version (see ownCloud admin page): 9.1.4 (stable)
Updated from an older ownCloud or fresh install: fresh install
Special configuration (external storage, external authentication, reverse proxy, server-side-encryption): SSL; OC installed on subdomain;

ownCloud log (data/owncloud.log)

-- empty --

Integrity status for oC9+
(occ integrity:check-core)

  - EXTRA_FILE:
    - perm.sh:
      - expected:
      - current: 1be51f448a71fcf44513a7c62e7f7217f11341017ebe4669dffb57151e1766b5a214cec8eade07c0205d93a97fba9c353765f688acb45b145950fae17c3b35fd

https://central.owncloud.org/search?q=login%20loop

-> https://central.owncloud.org/t/login-loop-token-expired-please-reload-page-csrf-check-failed/825

@kljhlkhglklfgh
This doesn't seem to be the problem... Sure it could be an error with the php environment but I changed everything as posted on the page you send and only after that it showed the CSRF error... I reverted the changes (except for the post max size) but it still keeps redirecting me to the login panel like before... No errors, no anything...

Solved the issue by setting session.auto_start to off instead of on

Thanks for your help