The other more important question, after about 10-12 days I lost access to Zenoss web interface. I rebooted the VM, and there are no graphs since then. Under each graph I see metric NA.

And the last issue I cannot ping/snmpwalk any of the devices from the web interface, but I can successfully ping/snmpwalk from cli.

Could you please help me troubleshooting these issues?

BTW, is it better to install Zenos from ISO rather than from Control Center?

Thank you!