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   Apache FAQ > E. Configuration Questions
Question:  I upgraded to Apache 1.3 and now my virtual hosts don't work!

In versions of Apache prior to 1.3b2, there was a lot of confusion regarding address-based virtual hosts and (HTTP/1.1) name-based virtual hosts, and the rules concerning how the server processed <VirtualHost> definitions were very complex and not well documented.

Apache 1.3b2 introduced a new directive, NameVirtualHost, which simplifies the rules quite a bit. However, changing the rules like this means that your existing name-based <VirtualHost> containers probably won't work correctly immediately following the upgrade.

To correct this problem, add the following line to the beginning of your server configuration file, before defining any virtual hosts:

NameVirtualHost n.n.n.n

Replace the "n.n.n.n" with the IP address to which the name-based virtual host names resolve; if you have multiple name-based hosts on multiple addresses, repeat the directive for each address.

Make sure that your name-based <VirtualHost> blocks contain ServerName and possibly ServerAlias directives so Apache can be sure to tell them apart correctly.

Please see the Apache Virtual Host documentation for further details about configuration.

This FAQ is from Apache Server Frequently Asked Questions

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