Here's a typo which caused the OpenVPN plugin to constantly fail: https://github.com/bashclub/checkmk-opnsense-agent/blob/7f7d90fab4d4ddadcd32ce1435af7a89427fe8e7/opnsense_checkmk_agent.py#L883 The ```OpenVPN_{protocoll}_{local_port}``` should read ```OpenVPN_{protocol}_{local_port}```.