Can't get the IP Address of some group members

I have 3 PCs, A B and C. They all connect fine with COMODO Unite:

  • the green flag appears at the side
  • you can chat form any to any other,
  • etc.
    They are physically connected under the same LAN.

However, when I look in the member list (of my own network)
i see the direct IP Address of only
on A and B,
C appears with no address… ???

I checked my firewall (ZoneAlarm) and
the Comodo Network is set as “trusted”,
so it should not be subject to blocks
(indeed, all other basic functions are all right).

Any idea?

I installed Hamachi on the same three machines.
It shows regularly the IP address next to
each member of a group!!! :smiley: