The Windows "Firewall" feature is created to protect the computer from hacker atacks. The Middleware receives incomming TCP/IP connection from the GRD/cLAN and the firewall can block them.
The easiest way to avoid firewall issues is to disable it. But this can be considered unsafe. So we suggest adding the MW as an exception to allow in coming TCP connections from the GRD/cLAN the MW to reach it.
Windows XP
Windows 7

2017-06-02