Everyone that plays Multiplayer on their computer, whether playing by themselves or running a LAN game has to start flserver.exe
Meaning you can play Multiplayer games by yourself without having to log onto someone's server.
I have tested hundreds of Mod's in Multiplayer mode using one computer by first starting flserver.exe and then starting Freelancer and then playing without any trouble although I usually deleted the Freelancer folder and then re-installed Freelancer again to make sure there weren't any files left in the Freelancer folder.
And after re-installing Freelancer, installing the
Quickfix files.
So you most probably have either some files that are causing the problem or possibly your firewall. If the problem is with the firewall sometimes just restarting flserver.exe and then Freelancer will work because now your firewall should be setup to let you access flserver.exe
Maybe if you gave more information, such as are you using a Mod, have you used and Mod's before and if you have, have you done a clean install of Freelancer - making sure that there are no files left behind in the Freelancer folder before doing a re-install.
Did you install the
Freelancer Quickfix v1.0c after doing a clean install of Freelancer?