I have the ME in my embedded product. I can see it’s MAC address listed in the DHCP server and can ping it on the XP command line. I have the firewall turned OFF.
Digi Device Discovery and the Device Setup Wizard can not find the ME.
As far as I know, the default firmware of custom DIGIs is the naFtpApp, which doesn’t contains the discover capability, nor any WEB page. I think that you have to load your own firmware compiled with NETOS6.3.
As I understand the situation you have a Digi Connect ME -S unit, running Digi’s Integration Kit firmware.
This firmware certainly does support ADDP (Advanced Digi Discovery Protocol). Although there is an option, within the web interface, to disable ADDP.
Assuming that you have not disabled ADDP, as indicated above, I must assume that you have a router or Ethernet switch between the Connect ME and your computer.
ADDP makes use of UDP broadcasts which as you may, or may not be aware, are typically blocked by routers and switches.
Try connecting the ME and your PC directly, via an Ethernet cross-over or a network hub.