Untill VERY recently i have been unable to connect to the majority of LFS servers.
I am not sure what caused it since nothing settings wise has been changed for a very long time now. I'm not exactly sure how long it has been like this since i have been just connecting to specific games (which it still can do) but i noticed it just under a week ago.
I currently have version 0.5V and my service provider is Virgin if that helps at all. I only use the Windows firewall, but like i say it has only happened very recently and worked fine with all these settings for a long time.
Here is an image of the screen i get after the end of the host check, which takes about 20x longer now.