Error message in proxy, another "zabbix_agentd" already running?
The other one is "Zabbix Server stopped". I assume that proxy uses server/agent code but did you plan to adapt messages to originate them to the proxy process?
15543:20081006:145759 Listener failed with error: Cannot bind to port 10051 for server 192.168.2.186. Error [Address already in use]. Another zabbix_agentd already running ?.
15417:20081006:145759 ZABBIX Server stopped. ZABBIX 1.6.
15417:20081006:145759 ZABBIX Server stopped. ZABBIX 1.6.