As explained by Dmitry:
When the server starts it starts on the first available interface; ie if in Transfer there is more than one network interface, Server always starts on the first:
Both networks must be ticked for transfer to find server - for the search panels Transfer is using the UDP Protocol, a broadcast connection.
To transfer to server we need to untick the virtual interface because
for loading a project, because Transfer uses the TCP Protocol for which
you need to specify one specific network interface.
Can we please get the option in the Server Web interface to specify the search and transfer network interfaces the same as we can in Transfer.
Customer support service by UserEcho