I have the same problem.
This is so strange... When i had Windows XP Pro, I hadnt this problem. Now i changed it to Vista Ultimate x64 SP1, and i have "Did not receive guest info". Setiings of my router (Pentagram Cerberus P 6331-42) are the same as before. I tried to disable Vista's firewall, but it doesnt help.
When i connected my old ADSL modem, it works. So, something must be wrong with my router. But why with XP was ok ? Operating system can change router config ? I really dont understand this...
I dont want to change OS. Vista works very well, except this issue with LFS.
May someone help me ?