Rcon failed - Can't auth to rcon

[s4wny]

Maybe not the correct place to ask, but why do I get this error message when I run php bootstrap.php and how can I fix it?

The full error message:

2014-10-18 20:14:36 - ERROR  [eBot\Match\Match] Rcon failed - Can't auth to rcon xxx.xxx.xxx.xxx:27015 (Connection refused (Code: 111))
2014-10-18 20:14:36 - ERROR  [eBot\Match\Match] Match destructed.

I run eBot on a VPS with a fresh installation of ubuntu 14.04. iptables are set to accept everything policy.

I think Connection refused (Code: 111) has something todo with OpenVPN.