1) Log-in to your Magento administration area then go to ‘System > Configuration > Web’.

2) Navigate to the ‘Unsecure’ and ‘Secure’ tabs. Make sure the ‘Unsecured’ and ‘Secure’ – ‘Base URL’ options have your domain name within it, and do not leave the forward slash off at the end of the URL. Example: http://www.domainname.com/

3) While still on the ‘Web’ page, navigate to ‘Search Engine Optimization‘ tab and select ‘YES’ underneath the ‘Use Web Server Rewrites’ option.

4) Navigate to the ‘Secure’ tab again (if not already on it) and select ‘Yes’ on the ‘Use Secure URLs in Frontend’ option.

5) Now go to the root of your Magento website folder and use this code for your .htaccess:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

Save the .htaccess and replace the original file. (PLEASE MAKE SURE TO BACKUP YOUR ORIGINAL .htaccess FILE BEFORE MESSING WITH IT!!!)

6) Now go to ‘System > Cache Management‘ and select all fields and make sure the ‘Actions’ drop down is set on ‘Refresh’, then submit. (This will of course refresh the Cache.)

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If you have multiple website or store than follow below step.

7) Got to ‘System > Configuration > web’ again. This time look for the ‘Current Configuration Scope’ and select your website from the dropdown menu. (This is if it is set to Default Config)

8) Make sure the ‘Unsecure’ and ‘Secure’ fields contain the same domain as the previous Default Config file.

9) Navigate to the ‘Search Engines Optimization‘ tab and select ‘Yes’ underneath the ‘Use Web Server Rewrites’ section.

10) Once the URLs are the same, and the rewrite is enabled save that page, then go back and make sure they are all checked as default then save again if needed.

11) Now go to ‘System > Cache Management’ and select all fields and make sure the ‘Actions’ drop down is set on ‘Refresh’, then submit. (This will of course refresh the Cache.)