После перехода с NetworkManager на systemd-networkd не стартует демон

/usr/lib/systemd/system/zabbix-agent.service

[Unit]
Description=Zabbix Monitor Agent
After=syslog.target network.target

[Service]
Type=simple
ExecStart=/usr/sbin/zabbix_agentd -f
User=zabbix

[Install]
WantedBy=multi-user.target

Заменить network-online.target

systemctl daemon-reload