If two Fileshare servers are on two different physical servers but both have the same name (and each connected to its own local MFDS), and both were started at the same time then one would fail to start with a duplicate name error.
By default MFDS will generate UDP broadcasts for search events. These broadcasts will be picked up by all/any local servers which then results in this duplicate name problem (even though each Fileshare server is using its own MFDS)
In order to prevent this happening and hence allow both of these Fileshare servers to exist on local machines, it is necessary to prevent the UDP broadcast search events.
This can be configured on the "Options" / "General" tab as on the screenshot below
Note that Routers will usually filter out UDP broadcast packets so it is only a problem where the 2 machines are on the same local network.