Do you see a Brick Wall icon at bottom left of LW's screen?



If yes, it means you are suffering firewall issues. Most likely due to your new router/modem you are connected to on the LAN. Else 'possibly' due to a software firewall on the main machine depending on how the LAN is set up, though less likely the reason.

I had similar issue when I first changed from dial up to broadband, and my first router needed to be port forwarded.

Some more details about both your machine & the LAN set up will help greatly: System details - help us to help you (click on blue link)