Deploy PHP application on IIS
try this web.config
<?xml version="1.0" encoding="UTF-8"?> <configuration> <system.webServer> <rewrite> <rules> <rule name="Rewrite to index.php"> <match url="index.php|robots.txt|images|test.php" /> <action type="None" /> </rule> <rule name="Rewrite CI Index"> <match url="^(.*)$" /> <conditions> <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" /> <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" /> </conditions> <action type="Rewrite" url="index.php/{R:1}" appendQueryString="false" /> </rule> </rules> </rewrite> </system.webServer> </configuration>In the config.php file, change $config['uri_protocol']= 'QUERY_STRING' to $config['uri_protocol'] = 'AUTO'.