Check out the thread below, it's full of info about connection & firewall problems:wink:
Connection problems? Check here first!

Make sure you're only using 1 software firewall & that it's configured properly. If you're connecting through a modem or router, these usually have their own internal firewall...that might be what LW's detecting. In that case, read the info about enabling UPnP & port forwarding.
Do the port test & see if it works.

What's changed since you were able to connect (new ISP, internet plan, hardware etc)? Have you started using a new version of LW?
If you're still stuck, post back with your details. Post 2 of the thread above will tell you the info we need