webserver down, cant find reasons

[dcreation]

You can start with a:

cat /var/log/syslog | grep apache
and
/var/log/apache2/users/default-error.log

But, it is much more interesting why apache wont restart.
If happens for the next time try to stop it first:
/etc/init.d/apache2 stop
Wait a second.. then look at the processes:
ps aux | grep apache
to verify it is really down. Then try to start it and copy and paste the error-message