I have the W7 64bit Host Vbox4.1.8 and two OL5.7 64bit Guests, Say G1&2. The Host Only Network has been setup for the guests. there have been the applications deployed on the both guests. all have been running no problem for a few months. Now I have found no ports on the G1 are visible to the W7 Host, which was not the case before: I can ping G1 server IP but no ports of G1 can be accessed from W7 Host; I can access all the ports of G2 from W7 Host; From G2 I can access all the ports of G1, and From G1 I can access all the ports of G2; All the applications on G1 are running normal. I access the Host and Internet from G1 no problem. I tried to turn off the firewall of the host but no luck. I am not sure what have canaged on G1 since last reboot. Please help with the troubleshoot.