HTTP Loopback connection are not enabled on this server


Can anybody help me with this error I am getting on the dashboard.

Important: HTTP Loopback Connections are not enabled on this server. If you need to contact your web host, tell them that when PHP tries to connect back to the site at the URL and it gets the error Response code: 401. There may be a problem with the server configuration (eg local DNS problems, mod_security, etc) preventing connections from working properly.