It could effect your downloads & it will definitely effect your uploads...not many people will be able to upload from you!

Have a look through the sticky below, there's a lot of info & possible solutions to firewall problems. Make sure that you're only using 1 software firewall & that it's configured properly rather than turned off. LW might be detecting a firewall within your modem/router, so check out the info about enabling UPnP & port forwarding.
Connection problems? Check here first!

If you're stuck, post back with your details. The second post of that sticky will show the info we need:wink: