Hi,
I´ve got exactly the same problem and it seems to be this:
Active: active (exited) since Mon 2016-02-01 13:46:21 CET; 8min ago
So, if you check the systemctl you will see that the mattermost service is not running (exited).
I followed some advices found online and checked the logfile:
[2016/02/05 08:59:28 CET] [INFO] Current version is 1.3.0 (4896/Mon Dec 14 23:57:09 UTC 2015/f51d45f6cba0e5a1249146afe4a1c78cf32b7598)
[2016/02/05 08:59:28 CET] [INFO] Current working directory is /opt/mattermost/bin
[2016/02/05 08:59:28 CET] [INFO] Loaded config file from /opt/mattermost/config/config.json
[2016/02/05 08:59:28 CET] [INFO] Server is initializing...
[2016/02/05 08:59:28 CET] [INFO] Pinging sql master database
[2016/02/05 08:59:28 CET] [INFO] Pinging sql replica-0 database
[2016/02/05 08:59:28 CET] [INFO] Starting Server...
[2016/02/05 08:59:28 CET] [INFO] Server is listening on :8065
[2016/02/05 08:59:28 CET] [INFO] RateLimiter is enabled
[2016/02/05 09:05:26 CET] [INFO] Stopping Server...
[2016/02/05 09:05:26 CET] [INFO] Closing SqlStore
It seems, there is a mistake within the /etc/init.d/mattermost ... unfortunately I have no idea as I took it from the installation guide.
If somebody have any idea to fix that, I´ll appreciate it and if I find out, i will post it 