Failing to start maxscale with init file on RHEL6

Hello,

After upgrading our dev cluster to MariaDB 10.1 I discovered that MaxScale would no longer start up when using the init script. (I don't think the upgrade is relevant to this problem, but thought I should mention it.)

Nothing gets logged in the maxscale log file when attempting to start it this way.

$ sudo /sbin/service maxscale start
Starting MaxScale: [FAILED]

I am however able to start it as the maxscale user without any problems:

-bash-4.1$ maxscale -d --user=maxscale
Info : MaxScale will be run in the terminal process.
Configuration file : /etc/maxscale.cnf
Log directory : /var/log/maxscale
Data directory : /var/lib/maxscale
Module directory : /usr/lib64/maxscale
Service cache : /var/cache/maxscale

What could be wrong?

Edited to add:
I should add that SELinux is running in permissive mode, so that shouldn't be a problem:

$ sestatus
SELinux status: enabled
SELinuxfs mount: /selinux
Current mode: permissive
Mode from config file: enforcing
Policy version: 24
Policy from config file: targeted

Also, running the init script directly gives the same error:

$ sudo /etc/init.d/maxscale start
Starting MaxScale: [FAILED]