[SOLVED ]Docker image gives "You took too long to log in"

Steps to reproduce

  1. On synology NAS, download docker image owncloud/server
  2. configuration default, mount a folder under /mnt/data, Port 8080 is forwarded to the docker image as port 8080
  3. start docker image

Expected behaviour

Log in via :8080 should work

Actual behaviour

Log in triggers error message “You took to long to log in”

Server configuration

Operating system:
Synology NAS, official docker image owncloud/server. Latest and 10.4 show same behaviour
Web server:

Cookies. I hate cookies. Needed to delete all the cookies I had before, now it seems to work (also did chmod 777 /var/lib/php/sessions)