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Do the other virtual hosts work as expected, when uncommented? 
 
Anyway first tweak, add a ServerAlias entry to each virtual host, to see if your loosing the www. &nbsp;e.g. 
ServerAlias &nbsp; &nbsp;site1.ca &nbsp; *.site1.ca 
 
If still broke compare the hostname configured for your Joomla site, with the virtual host name, and possibly try something a bit more generic e.g. <a href="http://docs.joomla.org/VirtualHost_with_Joomla" rel="ugc">http://docs.joomla.org/VirtualHost_with_Joomla</a>
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Do the other virtual hosts work as expected, when uncommented?

Anyway first tweak, add a ServerAlias entry to each virtual host, to see if your loosing the www.  e.g.
ServerAlias    site1.ca   *.site1.ca

If still broke compare the hostname configured for your Joomla site, with the virtual host name, and possibly try something a bit more generic e.g. http://docs.joomla.org/VirtualHost_with_Joomla [http://docs.joomla.org/VirtualHost_with_Joomla]

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I am running wordpress and joomla here. 
 
site1 contain joomla and site2 contains wordpress setup. 
 
When i have this setup the sites are not working properly. &nbsp;If i just keep site1 and comment out site2 and site3 it works fine. as soon i uncomment site2 or site3 , &nbsp; site1 is having issue. they all are in diff directories. Please advise. 
 
 
 
 
NameVirtualHost *:80 
 
&lt;VirtualHost *:80&gt; 
&nbsp; &nbsp; &nbsp; &nbsp; DocumentRoot /var/www/site1 
&nbsp; &nbsp; &nbsp; &nbsp; ServerName <a href="http://www.site1.ca" rel="ugc">www.site1.ca</a> 
&lt;/VirtualHost&gt; 
 
#&lt;VirtualHost *:80&gt; 
# &nbsp; &nbsp; &nbsp; DocumentRoot /var/www/site2 
# &nbsp; &nbsp; &nbsp; ServerName <a href="http://www.site2.ca" rel="ugc">www.site2.ca</a> 
#&lt;/VirtualHost&gt; 
 
 
&lt;VirtualHost *:80&gt; 
&nbsp; &nbsp; &nbsp; &nbsp; DocumentRoot /var/www/site3 
&nbsp; &nbsp; &nbsp; &nbsp; ServerName <a href="http://www.site3.net" rel="ugc">www.site3.net</a> 
&lt;/VirtualHost&gt;
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I am running wordpress and joomla here. 

site1 contain joomla and site2 contains wordpress setup. 

When i have this setup the sites are not working properly. If i just keep site1 and comment out site2 and site3 it works fine. as soon i uncomment site2 or site3 , site1 is having issue. they all are in diff directories. Please advise. 




NameVirtualHost *:80

<VirtualHost *:80>
 DocumentRoot /var/www/site1
 ServerName www.site1.ca
</VirtualHost>

#<VirtualHost *:80>
# DocumentRoot /var/www/site2
# ServerName www.site2.ca
#</VirtualHost>


<VirtualHost *:80>
 DocumentRoot /var/www/site3
 ServerName www.site3.net
</VirtualHost>

Name-Based Virtual hosts

The Apache HTTP Server is a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards. Typically Apache is run on a Unix-like operating system, but it is available for a wide variety of operating systems, including Linux, Novell NetWare, Mac OS-X and Windows. Released under the Apache License, Apache is open-source software.