Please do the following.
a) Get your setup into a state, when you are having trouble
b) On the computer with OneCare, Change Settings>Firewall Tab>Advanced Settings>Network Connections
c) Ensure all the networks that you see listed there are marked private
If that does not resolve the problem, please do the following
a) On the computer with OneCare, Change Settings>Logging tab
b) Uncheck the checkbox that says "detailed firewall logging", hit apply, check it again. If it was unchecked already, just check it and hit apply
c) Reproduce the problem
d) Run c:\Program Files\Microsoft Windows OneCare Live\OneCareSupport.exe to generate the log
e) File a bug using feedback site https://connect.microsoft.com/feedback/default.aspx?SiteID=168
Thanks for trying our beta and helping us work out the kinks.
Thanks a lot!
Neeraj Garg