Permissions Denied error on install

Permalink
Hi,
I'm trying to install concrete5 on my server. When installng, the following error occurs:

{"error":true,"message":"SessionHandler::read(): open(\/tmp\/sess_c33c7269b140a560f857317958b201ba, O_RDWR) failed: Permission denied (13).


Followed by a large Trace. I suspect it has sth. to do with the PHP on the server, which is configured as follows: 5.3.28 on the server, 5.6 (CGI/FPM) module domain. I cant find a .htaccess file.