[firebird-support] Why do i need wifi connection to connect to local host?

['Rjmittendorff (publiek)' publ...@rjmittendorff.nl [firebird-support]]

Using Firebird 3.0.1 on Windows 7, I noticed that an active wifi connection 
needs to be established in order to connect to localhost.
Without a wifi connection I get error: Unable to complete network request to 
host “LocalHost”. Failed to locate host machine. The specified name was not 
found in the hosts file or Domain Name Services.
As soon as I connect to the internet, I can also connect to the localhost (and 
my database).
But I do not understand this, the database is just on the hard drive of my PC 
so no internet connection should be needed.
I use default configuration files.
Any help please?
Kind regards,
Robert