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I assume that your are using Windows-7 WAMP Apache 2.4.2 (installed in C: directory) PHP 5.4.3 CodeIgniter 2.x   Download Hi there, the first question raises I our mind is  How to add a sub-domain to be reached at: subdomain.mainsite? So, here we start to create sub-domain for localhost. Step 1: Edit the file located in C:\windows\system32\drivers\etc\hosts add the following to it 127.0.0.1 subdomain.mainsite Save File Step 2 : Edit the httpd.conf file Add the following to the bottom of the file ########################## NameVirtualHost 127.0.0.1 <VirtualHost 127.0.0.1> DocumentRoot "C:\wamp\www" ServerName localhost </VirtualHost> <VirtualHost 127.0.0.1> DocumentRoot "C:\wamp\www\mainsite" ServerName subdomain. mainsite ErrorLog logs/subdomain_error.log </VirtualHost> ########################### Step 3: You must make sure the subdomain directory exists inside mainsite(CodeIgniter).