problem in making applications accessible after a shutdown of server for 2 months

[Tapas Mishra]

Hi all,
one of my server was shutdown for 2 months and today only it has been
switched on.
Here are the links
http://openitup.in
http://software.openitup.in
http://social.openitup.in
http://research.openitup.in

When we powered on the machine the virtual machines on top of it are
running but they are not accessible from internet.
Every thing 2 months back before shutting down was running.This is a
reverse proxy setup and I do not see the requests reaching
the Dom0 itself in Apache log.
What can be primary reason for this and what should I follow to trace it?
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Tapas
http://mightydreams.blogspot.com