Cannot save settings in admin panel

I cannot change settings anymore in the admin panel. It worked before but with the latest version somehow not.

Nginx Logs: 2017/03/13 09:48:59 [error] 595#0: *11 FastCGI sent in stderr: "PHP message: PHP Warning: file_put_contents(/data/server.ini): failed to open stream: Permission denied in /opt/mailserver-admin/src/Analogic/SettingsBundle/Controller/ConfigController.php on line 74" while reading response header from upstream, client: 172.25.0.102, server: localhost, request: "POST /admin/settings/update HTTP/1.0", upstream: "fastcgi://unix:/var/run/php-fpm-admin.sock:", host:

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