Your default context is user_u:system_r:unconfined_t Do you want to select a different context? is caused when SELinux prevents Cortex from starting. To get past this you can either disable SELinux or allow Cortex to pass through SELinux. To disable SELinux log into your server and edit the file /etc/sysconfig/selinux. Make sure the SELinux line reads:

SELINUX=disabled

That will prevent it from enabling on boot. Run the command setenforce 0 to disable it in your current configuration.

Cortex uses the RedHat httpd subsystem to run, so if you want to keep running SELinux you must disable protection for the httpd daemon. Run the command:

setsebool httpd_disable_trans=1

That should keep Cortex up and running.