Can you tell us your OS version, which firewall you have, version of LW, what connection devices you use (brand & model no.) Are you working off a router or is your net connection via the network. Are yo connecting from work, home, school, etc. What type of lan is it & what devices are involved? All these details are potentially very important! So please take the time to find out the answers to all of these questions.

Sorry I missed the point about Sp2 which means you're using XP. I presume you enabled LW access thru XP's firewall!?