SharePoint 2013 and 404 on Every Site and Central Administration

When i go to http://spsite/pages/default.aspx the page appears. If i go to http://spsite/ the page does not redirect, and instead shows a 404 error.

Solution:

1.Go to Server name in IIS

2. Open ISAPI and CGI Restriction

3. Add below 4 entries in it.

Description: Microsoft SharePoint Foundation 2010

 C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\isapi\_vti_aut\author.dll
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\isapi\_vti_adm\admin.dll
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\isapi\shtml.dll
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\isapi\owssvr.dll