Virtual hosts

[Stormy <stormy22@xxxxxxxxx>]

Just finished setting up a new server (Ubuntu 11.10) and copied/pasted all 
conf files for Apache2 from an older fully functional server (Ubuntu 
10.04). All the virtual hosts are functioning, but on apache2 restart I get 
the following warning (the old server gives no warnings, just a clean restart):

 * Restarting web server 
apache2                                                [Wed Nov 30 14:02:12 
2011] [error] (EAI 2)Name or service not known: Failed to resolve server 
name for 127.0.0.0 (check DNS) -- or specify an explicit ServerName
[Wed Nov 30 14:02:12 2011] [warn] NameVirtualHost 192.168.0.90:80 has no 
VirtualHosts
[Wed Nov 30 14:02:12 2011] [warn] NameVirtualHost 192.168.0.90:80 has no 
VirtualHosts
etc, etc 19 times
 ... waiting [Wed Nov 30 14:02:13 2011] [error] (EAI 2)Name or service not 
known: Failed to resolve server name for 127.0.0.0 (check DNS) -- or 
specify an explicit ServerName
[Wed Nov 30 14:02:13 2011] [warn] NameVirtualHost 192.168.0.90:80 has no 
VirtualHosts
[Wed Nov 30 14:02:13 2011] [warn] NameVirtualHost 192.168.0.90:80 has no 
VirtualHosts
etc, etc 19 times

The only differences that I can find between the two installations (used a 
"default" install on both) using apache2 -V are that (a) the new version is 
2.2.17 (old 2.2.16) and that (b) the new one gives me

-D APACHE_MPM_DIR="server/mpm/worker" while the old gives
-D APACHE_MPM_DIR="server/mpm/prefork"

Is there anything in 2.2.17 c/w .16 or in the worker/prefork that would 
explain this? And is there a quick method of changing worker to prefork?

Tnx - Paul


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