404 - File or directory not found. when use codeigniter in windows iis

Facing error message when deploy codeigniter php site to windows server 2013 (iis8)

404 - File or directory not found.

The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.

The main issue is because of the url rewrite doesn't work in IIS without proper setting in web.config (IIS doesn't read .htacess)

What we need to do is open web.config

Add code below into the correct

<rewrite>
  <rules>
    <rule name="Rule" stopProcessing="true">
      <match url="^(.*)$" ignoreCase="false" />
      <conditions>
        <add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" negate="true" />
        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" ignoreCase="false" negate="true" />
        <add input="{URL}" pattern="^/favicon.ico$" ignoreCase="false" negate="true" />
      </conditions>
      <action type="Rewrite" url="index.php/{R:1}" appendQueryString="true" />
    </rule>
  </rules>
</rewrite> 

>

If you are want to create the new web.config without others configuration, the web.config shoud looks like this

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

<system.webServer>

    <httpErrors errorMode="Detailed" />
    <asp scriptErrorSentToBrowser="true"/>

   <rewrite>
  <rules>
    <rule name="Rule" stopProcessing="true">
      <match url="^(.*)$" ignoreCase="false" />
      <conditions>
        <add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" negate="true" />
        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" ignoreCase="false" negate="true" />
        <add input="{URL}" pattern="^/favicon.ico$" ignoreCase="false" negate="true" />
      </conditions>
      <action type="Rewrite" url="index.php/{R:1}" appendQueryString="true" />
    </rule>
  </rules>
</rewrite> 

</system.webServer>


</configuration> 

Hope this helps

Cannot modify header information - headers already sent by

Facing error when try to use codeigniter and the page won't redirect after update / edit

 A PHP Error was encountered

    Severity: Warning

    Message: Cannot modify header information - headers already sent by (output started at xxxxx:1)

    Filename: libraries/Session.php

    Line Number: 675

 A PHP Error was encountered

    Severity: Warning

    Message: Cannot modify header information - headers already sent by (output started at xxxxx:1)

    Filename: helpers/url_helper.php

    Line Number: 542

How to solve my issue?

open index.php and add ob_start();  like below

ob_start();

/*
 *---------------------------------------------------------------
 * APPLICATION ENVIRONMENT
 *---------------------------------------------------------------
 *
 * You can load different configurations depending on your
 * current environment. Setting the environment also influences
 * things like logging and error reporting.
 *
 * This can be set to anything, but default usage is:
 *
 *     development
 *     testing
 *     production
 *
 * NOTE: If you change these, also change the error_reporting() code below
 *
 */