After deactivation of all plugins on your site, you need to use FTP to download the .htaccess file as a backup.
Then you need to contact your web host, because it is most probably a configuration issue at their end.
However, if you do not have a reliable Word Press hosting provider, and they deny having any issues and/or refuse to help you, then you should consider switching web hosts or fix it yourself.
If you have your address with www prefix, then change it to non-www URL, and if you have it with non-www URL then add the www prefix.
Important: Make sure that you don’t leave a trailing slash at the end of your URL like In case you don’t have access to Word Press Admin area, you can still update these settings by defining them in file.
As you know that Word Press has SEO friendly URL Structure which uses the redirect function.
Several other popular Word Press plugins also use the redirect functionality.
Due to a misconfiguration in any of these redirection tools, your site may end up redirecting users to a URL that is actually redirecting them back to the referring URL.
In that case the user’s browser is trapped between two pages and hence you see the error. Most web hosts allow you to choose whether you would like to add a www prefix to your domain name or have it without
In case you had selected to add www to your URL, then adding your Word Press settings will cause the error.
Or if you opted to use your domain without www prefix, then adding it with www prefix in Word Press settings will cause this error.
When a user will come to by Word Press because that’s what you have set up in the settings.