Good afternoon!
Faced such a problem CSRF check failed
Http://prntscr.com/f95uiw
Through the client from the computer comes through the browser there.
What could be the problem?
OS Centos7
This is mostly a server mis-configuration where all known infos are collected at the following comment: https://github.com/owncloud/core/issues/25927#issuecomment-262703655