IOGear GUIP204 v2 - Manual (Page 13)

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If your Windows system or firewall
program blocks the program,
PLEASE
“UNBLOCK” or “ALLOW ACCESS” for
both Private and Public networks.
After you have done this once, the system
will remember your setting and not ask
you again.
Certain anti-virus or Internet security
programs have firewall functions that
might prevent this program from access-
ing the network. Please make sure that
you unblock this application from these
programs as well.